Well, to be fair, he is the biggest badass in the Legion. If he wants to fall back, who the hell is going to cross him?
Also, while the NCR, Legion, House, and going it independent all have their dumb sides, you only have so much ability to affect things, and here's what realistically is possible given that pull you possess.
House: It's pretty clear House knows despite all he can do on his own, he needs a proxy and he also knows he's not going to be able to stay alive forever. He's clearly hoping to turn you into his successor if any hope of leaving his suspended animation chamber is off the table, which is likely is. He's a myopic douche with a "my vision for Vegas, fuck everyone else" kind of thinking, but given how much his perspective is limited, it might be worth letting him take charge with you as the proxy to at least keep Vegas functional with minimal BS from anyone else.
NCR: They are hideously inefficient without you to cut through the red tape, but having them around might be worth it for the commercial benefits, so long as you're willing to accept you'll have to be pretty hands-on to make sure their rule is more a benefit than a hindrance.
Legion: You are signing up for a bunch of brutal assholes to ensure safety at the cost of liberty, but if you pick this option, you accept there brutal POV as necessary to keep Vegas safe. You otherwise don;t have much say here.
Independent: You forego the safety provided by the Legion, the commercial benefits of the NCR, and Mr. House's pragmatic if myopic oversight, but you do so expecting that your hands on approach to removing any major power players save yourself will result in the natives of New Vegas prospering without the above three's interference.