It's also useful to note that the Families are still first generation converts, still retaining their tribal affinity. Exposure to modern civilization will slowly erode that and ensure they'll be more productive and less savage with time.
In short, you're working off of mistaken assumptions and misrepresenting House's stance. It's a function of not understanding the power structure of the Strip, where House always wins.
They're not tribal to begin with, in my opinion. They're all playing their assigned roles quite well already. And no, I'm not misinterpreting House's stance, I'm saying that House is NOT portraying his stance to the people. The Courier hears "we need to make this happen for the good of mankind." Everyone else? LITERALLY everyone else? They hear "do what I say and get money." The result is it produces a culture of shallow, selfish people who see money as the only important factor, with no other goals in mind. And I'm not saying it'd fail immediately; I said clearly in my post that House is what's holding it all together. I'm saying that with House's death, the Strip will turn to [censored]. House isn't immortal, he's simply extended his lifeline to be far longer than usual, but his own dialog implies that yes, he'll still die. One can of course say "well the Courier will understand his goals and carry on his goals," my argument is that I consider the Courier an X-factor, in that case. We don't know that for certain; hell, I consider that to be by design, so players can happily state "My Courier understands House/Legion fully and will flawlessly carry on their wishes once they're gone." Easier said than done, and we can't know that for certain.
Long story short, Caesar indoctrinates his entire Legion. The reason he does so is because he's trying to purge humanity of greed, selfishness and other such base desires. While I'm sure many of us can agree it's a frivilous war given that such things will likely always exist, Caesar makes a valiant effort in doing so, as the Legion is often so alien to the other cultures of the Mojave that they see the sacking of Nipton as a glorious and righteous triumph (because it's residents are "self-interested [censored]s" who don't care for their fellow man) whereas others consider it a slaughter. House, for better or worse, doesn't attempt to do this. I'm not saying he SHOULD be attempting indoctrination, I'm simply saying that the ONLY clear message he's sending to the people of New Vegas is "comply with me, get money; don't comply and pay the consequences." The issue is that House, while he does keep it in check while in charge, is going full-speed ahead towards a culture of greed and self-interest the moment he's gone.
I'm drawing my conclusions from survival of the fittest, and the game endings. House clearly has an intent to expand based on game endings, ONLY avoiding Freeside if the Kings fight the NCR. Even if he does avoid Freeside, the point is an intent to expand exists.
Are you telling me that the Three Families, comfortable in their casinos, provided with everything they need, are less likely to "expand" than the Kings or the Followers, who have to deal with the troubles of Freeside?
I'm saying it's as simple as this: you know what means power in today's world? Money. You know what happens as a result? I bet a very, VERY large percent of us were raised with our parents saying "get a good job that makes lots and lots of money." House is supporting three families in particular, and as such, he's supporting their actions and their attitudes. With that, citizens of New Vegas are likely to pick up on that and adapt. Let's say, hypothetically, House were to decide he's going to expand further and take Westside, Freeside and Eastside (Fiend Territory, basically), telling all it's citizens that they either need to play along with some new plan of his or get out. You think as many people would deny his offer as before? No, some of them would accept the offer having CLEARLY seen how well off the three families are compared to those who initially turned down the offer last time.
House simply shows no interest in such matters. You mentioned the Omertas and Mortimer? You were half right. Yes he keeps the Omertas in check because that threatens his entire "business." Mortimer? No no, the Courier has to stumble across that little problem and handle it himself; House doesn't care because he considers it small-time. He knows full well what the White Gloves are capable of, but he never sends you to deal with them.
With House at the wheel, yes, we can very well expect him to simply drive his "employees" to do whatever he likes, and his "hand of God" interference with things like the Omertas may send the right message. Once he's gone however, I can only see the remnants of his nation having built-up a toxic culture, based on what we know so far, simply because the ideals and the cultures he's supported thusfar have been very self-interested while those he's oppressed have been the opposite.
I'm simply asking myself "what happens to House's regime once House is gone," and to be quite frank, I don't see it any better than the answer to "what happens to Caesar's regime once Caesar is gone." As I stated, House has his goal of progress for humanity, but do his
employees share that goal? Were they given a memo informing them that was the goal? Who takes over once House is gone? Only the Courier knows what House's vision looks like, and we can't say whether or not the Courier would do so properly or not. The only difference is that while Caesar has, at best, 30 years, House may have another 100 or so, thus it'll be a while before such issues manifest themselves. The issue is however that by that time, they'll likely be irreversible in that they've become a standard for the culture, and then all the greed of his followers can easily undo all the progress he may have made.