This was pointed out by going through extra dialog with Mr. House early on. Mr. House brokered a deal with the NCR to prevent them from annexing the Strip as the Legion was building up; effectively using the Legion to his advantage in the deal. They do not have many resources in New Vegas and it is stated quite often. All of their force is focused on holding one asset: Hoover Dam. The Strip is a secondary asset that does not require many resources to maintain; as it is not on the front line. In other words a full annexing of the strip would move enough resources from the dam to allow a successful Legion assault allowing them to take the area with minimal causalities. The NCR can not afford that as the entire home front is seeing this conflict sour rapidly. The NCR is not exactly stable and needs this massive national moral boost. Failure in the Mojave would hurt the entire NCR as that is a massive loss in resources.

Thus why Mr. House was able to broker a deal in the first place. As he also helped get the dam back online for them.

I think the only "faction" that could possibly make the trip West to East in the potential timescale would be Crimson Caravan.

It would be cool if they managed to establish a "Silk Road" between the East and West Coast.

Hmm, a faction that could possibly rival. YES. Though, would the time from Fallout 3 to Fallout 4 be enough for a "new" faction to gain that much influence? Interesting.

Crimson Caravan Merchant: "I seen some s---."

Seems more likely than anything else. They are about the only ones with financial motive to go that far... or die trying.

It'd be cool if a new government started to form on the east coast after the events of Fallout 3.

Player: "So what's Chicago like?"

Crimson Caravan Merchant: "Big hole in the ground. Ain't s--- there."

Player: "Misourri?"

Crimson Caravan Merchant: "Miss Uri? Never met her. She a looker?"

No, it's unlikely we'll see in F4, a faction in size that can rival the NCR or Caesar's Legion. We should have seen such a faction in F3, that was around even before F3 started. But in F4, we could see a faction that is more of the size that the NCR was in it's earlier years, where it was primarily in California itself, and maybe expanding into parts of Oregon, only East Coast states obviously. But there wouldn't be a faction that could grow so fast in the East, between the time of F3 and F4, to rival the NCR/Caesar's Legion in size. And Bethesda shouldn't even try that, it will piss a lot of people off.

It's Bethesda, we've already had the: BOS, The Enclave, super mutants and Harold make this journey.

I honestly wouldn't be surprised to see Mr. House's life support chamber cresting a wave flowing into Boston like a piece of driftwood

They could use those rangers or power armor troops to destroy M house and his army of robocops.

Hell even i can do that alone.

They won't even need rangers or power armor troops if they organised their drunk troops in NV.

But yeah everything i hear is that they have problems everywhere and they can't do ''''''' .

Maybe if they got of their lasy asses they could do something,this is also a reason why i don't want them in the new game.

The answer to that is very simple, for the same reason they didn't use their best military units against Caeser's Legion.....they were trying to fight the war on the cheap, with poorly equipped, barely trained cheap conscripts.

Operating aircraft is an expensive business.

We have no way of knowing how many vertibirds that NCR was able to acquire from the Enclave (and maybe) BOS, we know that they are trusting enough of the one vertibird we have seen that they are willing to trust it to carry the NCR president. I'd assume that to keep it running and operational you would need multiple trained pilots, trained ground crew and plenty of stores all of which suggest to me that its not the lone aircraft in the NCR's arsenal.

I don't think you understand; they are quite literally stretched too thin. That is why they can not even stop simple raiders from taking over Primm. Simple raiders armed with bolt action 5.56 rifles & 9mm semi-automatic pistols. If they can't do that, plenty of other similar areas, then there is no chance in taking the strip. Especially considering they rely upon numbers to win while forming a human shield to push forward with. Mr. House summed it up quite well calling their tactic tunnel vision. Does not allow for much in the way of ground control.

It's highly unlikely you'd spot NCR anywhere that far north-east. What you may find instead is probably the Desert Rangers. It'd be interesting to see them return. While they were based in Nevada... or Airizona if it's a true nod to the Desert Rangers in Wasteland.

lol true

As i said before if they just organised their troops in NV they could destroy House with ease.

Next we have Primm that they also could easily take if they coordinated their actions with the local population.(that is also very good armed)

About that tactic i don't think they will lose lots of men trying to fight robots with pistols.

In WW1 for instance where nations also used this tactic they had high casulties because of the MACHINEGUNS AND ARTILLERY fire.

M House (in the beggining) has no machine guns and artillery.

You've already been presented with why they did with what they did. Take it or leave it. : )

I'l take it but you're theory that they are weak and can't do anything isn't correct either.

Maybe Yes man and his robot army headed east because he heard about the institute's androids.

Rollin, rollin, rollin.......

I never said they were weak and can not do anything. I simply told you why they are doing what they are doing. : )

I don't give theories.

To be fair Yes Man appearing isn't too bad. He did yes was going to get fixed so he isn't so nice all the time.

It usually, doesn't work that way.

Let me give you a real world example: My country since the 1960's has adopted a strategy very similar to what you are suggesting, "We will bomb them into submission!"

Tell me, how often has that actually worked for us?

Technology is a Force Multiplier. It allows you do do more with what you have, but you have to be willing to commit that Force do be multiplied or you are just creating the equation of "X = Techology * 0"

The mathematics of war is heartless.

If you want to take and hold ground, the fastest and cheapest method that offers the highest chance of success to dig someone with a rifle out of a hole, is to send three people with rifles into that hole after him, and chances are excellent that you will lose two of your people doing it.

{Edit}

Besides, if the NCR did it your way. The ending for Fallout NV would have truly svcked.

It was meant as a joke, but Yes man and the other robots would probably have the easiest time crossing to the east coast, as long as they had power and ammo they would able to stomp on most of the local factions on route and travel day and night.

It's mostly likely we won't see the NCR.

2 diffrent things.

Yes you're country uses that tactic but it cannot be compared with the style of war that FNV uses.

All the countries you're country has bombed (and is still bombing) are using Guerilla Tactics.

The Caesars legion fights an open war.(hell their main base of operation is on a perfect spot to be bombed)

So they will lose lots of men this way unless they change their tactics.