If we want to discuss the merits of a House ending, we need to truly understand what a House ending entails. What I'm see here is a lot of speculation without much evidence.
Right now, we've been discussing what House has done pre-Hoover Dam. After his ending? Mr. House makes it clear what he wants to do. He's going to ransom Hoover Dam power to the NCR to make a load of money off them in that sense, and "after a few months, half-a-year, the tourists (and their money) will be pouring in. Vegas will be a shining jewel in the middle of the desert. An oasis of light. A beacon, to show mankind the way to the stars." (-Mr. H) So, we get a picture that if you play the cards right, and spare Kimball, his economy will go under for about half a year, but the NCR citizens will return to New Vegas to do what they always do. Win-and-lose fortunes in the blink of an eye. So he's getting two sources of money right-off the bat. The future of Westside is unknown, although it is likely that he annexed it with his securitrons, considering they don't have a ruling body. That's a third source of income.
What does House want to do with the money? Well, for starts, give some to the Courier. This much is already known by the way he talks to you and the way the ending plays out. "He [gives] every luxury at his disposal to the Courier, out of gratitude, and a quiet sense of pride in his choice of lieutenants," (-Ron Perlman). "[He's] not offering an incentive as crude as money, although there will be
plenty of that," (-Mr. H). What will he do with his money on a large-scale? "Give [him] 20 years, and [he'll] reignite the high development sectors," (-Mr. H). So, basically he's going to bring back the Old World Economy and Technology. Before you know it, instead of having men and women do construction work, he can have Mr. Handys and Robobrains working on such. So, mankind is progressing, while mankind doesn't actually have to fight or build, because the securitrons (and possibly other robots) would do it for them.
"Vegas' economy is a blast furnace that can forge the steel of a new rail line, running straight over the horizon," (-Mr. H). So, he's going to use Vegas' economy to resurrect Old World values and progress (except for Democracy). In the short term, Mr. House will only care about New Vegas. That's a given, considering that Vegas is the key to his goals. But, "Mr. House's walls are his power. They'll get bigger. The Mojave'll become Vegas," (-Ulysses). A good thing about the House ending, is that the ending is good for Legion and NCR as well. The NCR retreats, publicly disgraces Oliver, kicks Kimball out of office, and elects individuals with more integrity and less war-mongering tendencies, such as Hanlon, while still maintaining business relations with Robert Edwin House.
The Legion also needs to stay where it is. While their forces are annihilated in the Mojave, they were not wiped out. The tribes in Arizona need them, considering that the Legion swallowed them all up. So, with Lanius at the helm, you can convince him that the West is a trap that should not waste the blood of the Legion. He goes back and colonizes his territory. All-the-while, Mr. House makes more-and-more-and-more-and-more-and-more-and-more-and-more money.