Based off the state of the NCR/BoS in the story I'm inclined to believe a Mr. House ending

I really doubt they'll have a courier ending but Mr house is definitely one of the better written characters and considering the fact they hyped him up it wouldn't make sense for mr house to have been 9 iron'd

Best way to do it would be a Mr House but incompetent ending: Strip families run amok and the freeside holds a lot of power. Platinum chip/securitons get fucked up and Mr houses army isn't as powerful or omnipotent if the bunker factory kept working.

Caesar could make a return I wouldn't mind seeing that either