If House speaks the truth, then he is very likely the best choice in the long run. However, there are concerns. His callous mass-murder of the Brotherhood of Steel suggests that his vision for humanity might not jibe with anyplace where a decent person would want it to go. A man who will kill dozens for a "greater good" will kill hundreds, or thousands, or even millions. On the other hand, if the player remains witrh him, living in the lap of luxury in the Lucky 38, he can always put an end to House if his actions get too despicable.
I personally regard the democratic NCR as the "good karma" choice, the tyrannical Legion as the "evil karma" choice, and House's autocracy as the "neutral karma" choice. Independent NV is the "wild card" choice, it depends on the nature of the player.
BoS only take weapons, to attack people for more weapons. House says they never go after any helpful technology, which is ture, give ed e to them and another character the followers. Followers get solar power, BoS eye bot army...
Also you mean the same democratic ncr who forced vault city to join them by hiring mercs to attack it, until they joined ? The same guys wanting to wipe out jacobstown ? The same guys trying to steal the strip from house, and because he wouldnt hand it over had house killed ? Yes great people, no different to the legion, or any invaders. Self serving.
Is it possible? Sure... Likely in his timeframe (100 years)? No.
First of all yes I do believe its possible. As the former head of RobCo and the saviour of Vegas I believe that there are very few things that are not possible for Mr House.
BUT... and there is a but.
The finances and raw materials of such endevours would be significant, highly risky and dependent on several factors out of his controll. It would make more sense to expand and employ the "Vegas solution" to other cities around the US. Building a chain/federation of "city states" would be more cost effective generate more caps, and facilitate more information on what resources would be available and the potential of said resources.
See.. whilst the earth might be a wreck after post apocalyptia it still holds vaules, minerals and assets far easier to exploit here, than in a hostile environment such as space... or even another planet. At the very least House would need to build a robotics/renovate a factory and either renovate one or more REPCONN facilities or build them from scratch. He would need the raw materials to construct the robots and the rockets. He would need people to fly them, or (if he had robots flying them) need someone to act the role of colonizers and train them as well. Even if I think House can achieve great things I think a 100 year timeframe is rather optimistic. Unless he has yet another ace up his sleeve... which I would not put past him. After all... RobCo would have been major company with significant assets and he didnt spend them all on Securitrons and construction the lucky 38. He could very well have some "shake and bake" constructions hidden that we know nothing about.
*imagines lucky 38 launching like a rocket into space*
I think house can do it he has caps for resources, the dam for electricity and the knowlage.
Best chance anyway, the rest of the factions scavenge, House builds.