The Enclave itself would either break down and turn itself into a new conflict.
Also power struggle in the Enclave might not make it a nice ride. And as far as I was aware the Enclave treats people who are not Soldiers as inferior. Civilians are second class.
Why would the Enclave break itself apart? They have controlled their own population very well seeing as how they are all cramped up in such a small environment, whole generations passing without even seeing the sun. The only point of conflict within the Enclave are those who believe the Project is wrong like Autumn, if the Enclave had won in 2242 however Autumn would only be 20 and the rest of the Enclave higher ups seemed perfectly content with the plan, and once the plan is done, how can anyone resist it? You are incorrect, the Enclave treats it's own people all the same, the Enclave are not a military faction, the Enclave is the government, including politicians, the US Army and civilians, all however as citizens of the United States of America.
And mass genocide no matter what the reason makes you a maniac. The Enclave gave me the vibe of "we are doing this because you are beneath me," basically they thought everyone was dirt beneath their boots. I would also like to say that they are in fact like Nazi Germany, both were trying to create the "pure world". The wasteland is like hell their are problems but the NCR makes progress and is making less people starve and the wastes a better place, so why should the Enclave do the same thing and kill everyone while they are at it. Why cant Europeans survive. Because the Enclave's leadership was insane and a maniac.
They are like Nazi Germany in many regards, but not in the regard that they want to enslave people, they want to rebuild the human race,
thier race admittly I didn't say they weren't bad people but their not Bond villians, in the end the human race as a whole would have benefitted, because the human race would then be soley the Enclave. The Enclave give the vibe, "The ends justify the means.", they don't care how they create a safe world for themselves. It is not insane or manical from their prospective, the fact that the whole human race would benefit is purely incidental, the Enclave wants to save itself but regardless of their motives all humans born into this new world would live in the world I described.
The human race has survived, they are going to survive until someone rebuilds a nuke. I dont see how the Enclave are making the human race survive, they have been through a Nuclear War, slavers and raiders are not going to extinct the human race. It might be hell in areas for a while but it will get better. SO no the Enclave would actually doom the Human Race because their is not enough members for them to have a proper gene pool.
In the 150 years they spent on the Oil Rig they never faced such a problem, at least in 2242, they were plenty enough people to continue the human race.