Microsoft isn't in danger of going bankrupt, but they won't stay in a space where they don't make any money.
I separated them into high end consoles because if Xbox leaves the market, there would only be one console capable of running the latest Assassin's Creed or Street Fighter or what have you. That would effectively be a monopoly in that space.
I mentioned other third party publishers because you seemed to be under the impression that the third party space is under threat for losing one player. It's a large player, for sure, but that space is very healthy.
If you're concerned with the size of Microsoft just in general, which absolutely makes sense, because they're enormous, what happened in today's news is that the FTC failed to prevent the acquisition based on the evidence for this market. Their next course of action will be to see if Microsoft should be broken up after the fact under anti trust, and if that happens, as a non expert, I'll wager the gaming department stays together as one entity.