Haha, the reason they were destroyed in the earlier Fallout's was that Black Isle (the previous developer of Fallout) as well as Bethseda used the Enclave as the main villian in the story, and with the heros of Fallout (i.e. The Chosen One and Fallout 3's 101 Hero) having what I would call "protagonist immunity", the near impregnable fortifications of Enclave were squat. They were actually in the process of wiping out the Wasteland, both in the west and the east. However, in both regions (Spoiler Ahead), the respective hero of each story (2 in the west and 3 in the east) stopped them before their plans came to fruition. Both Enclave forces attempted to cleanse their respective domains using techniques that wouldn't include potential casualties (remember, there aren't many remaining "pure humans" out there, and the Enclave needs as many as it can find and use). Rather than risking the deaths of many troops, they opted for a lengthy but effective plan where they would use chemicals mixed with the local environment to cleanse any opposition or impure beings inhabiting the area. In Fallout 2, the Chosen One stopped the Enclave from using the FEV virus to spread into the air and cleanse any mutated or impure beings in the area. In Fallout 3, the 101 Hero joined the BoS (which are rivals to the Enclave in both origins and current situations), and wiped out any significant Enclave force in the area. This included Raven Rock, President Eden and his plans to use FEV-filled water to kill off any impure beings in the area, and the fallback bases they would subsequently use afterwards.
That's what I'm pricked about, the fact that you could never actually join or help the Enclave. The extent at which you could help the Enclave in Fallout 3 was to install the FEV-virus into the Jefferson Memorial water filtration system, and even if you did, the game by then was over, and there was no established aftermath of installing the FEV-virus where any mutated beings or humans were killed off. I really hope that at least in a DLC (or perhaps Fallout 4?), you will be able to join the Enclave. In Fallout 3, you were basically forced to join the BoS, as there was no other major military faction you could essentially join (Enclave included). In Fallout 2, you had to defeat the Enclave, as their plans were "evil". In Fallout New Vegas, we're finally seeing options to join whatever side you like, be it good (essentially the good 'ol democracy of the NCR), the bad (the tribal roman-like faction called Caesar's Legion), and the rest (New Vegas in all its glory). Seeing as how the Enclave was played out as the "bad guys" in the previous two Fallout's, I'm hoping that could change in the next DLC's and/or titles. In Fallout NV, you could sort of join the Enclave, but like I said, it's really not an Enclave force as much as it is a bunch of geezers armed with high tech weapons, armor, and a helicopter. And by the time the Enclave Remnants join you (assuming they do), the game is practically over. I'd like to see a central conflict with a true Enclave force that you could join and fight for in the future.
If not in any NV DLC, I'm hoping that the Enclave forces stationed in and around Chicago will play out nicely in the future (depending on where the next Fallout game will be located in). Unless of course, Bethesda decides to introduce some new Enclave forces that is canon. That would be fine too. If it's not to far-fetched, Canada could be used in some way, since we know prior to the Great War, Canada is part of the US (some secure bases established in Canada that were designed to shelter Enclave forces could exist).
Oh, and yes, I am essentially Enclave biased, so take what you will from the above.
I completely agree with everything you just posted good sir! :celebration: