Let's say I'm working the various quests in New Vegas, and am currently in the early stages of both The House Always Wins and the Wild Card quests.
What is the latest point in The House Always Wins that I can safely complete the Wild Card series, assuming I want to take control New Vegas?
(Note: I do plan on finishing off as many side quests as possible before going this route, so time is not exactly a factor here — I just want to be sure I don't go so far down The House Always Wins that I'm unable to do the Wild Cards.)
Best Answer
The wiki you linked reports:
Basically, whomever you tell the Boomers will support you is the faction you'll be locked to for the remainder of the game.
That said, I did tell House I had the Boomers on my side after telling the NCR so, but I told House after the notification 'If you continue helping Mr. House the NCR will no longer accept your help' so I think that that message (or one like it) is your cue.
The exception is Yes Man. None of the quests close if you tell him the Boomers support you (probably because the meetings are a lot more clandestine).