Aside from lacking any comprehension of his own limitations, Mister House suffers from the same flaw as Caesar. Namely, he thinks that he alone can save humanity from the post-nuclear nightmare they created. He can't. Nobody can. No single person is going to come along and sweep away the Wasteland and the past 200 years with some scheme involving robots. If someone did manage to force order, it would be that person's order, and it'd vanish the second they did. Caeser has the same issue. He is not Julius Caesar, no matter what his people think. He's an egomaniac cosplaying as him. What he's built isn't an empire, it's a legion, an army, and it's founded on nothing more than stolen ideas and his own personal charisma. Without Caesar, it's nothing but a band of well-organized raiders. Humanity itself has to learn from it's mistakes, come back from the brink, form stable societies, advance technologically, and reclaim the planet on it's own. The NCR is a democratic nation that evolved organically, sustained itself for a century, and has organized itself well enough to gather wealth and expand it's influence. That's far more likely to produce results than either other faction.