Dr Fallout
Centurion
Exactly, so if the NCR collapses it all breaks down, the economy collapses and Mr House is left with what? Empty Casinos?
The Hoover Dam, and Lake Mead may well be the single most valuable asset remaining in the world, however. Plus, Helios One can be put into working order pretty simply even if the Courier didn't bother with it, so Vegas will have power and a good source of clean water that most in the wastes would envy.
The power alone could be leveraged into making New Vegas a manufacturing powerhouse.
Even though, people won't be as willing to spend money on the casinos especially if the Wasteland becomes more dangerous.