IMHO, there is no room for a 70B investment in games at this time. The industry is mature and won't be growing any time soon, at least in the West. There had been a rush of investors founding new studios and propping old ones in the past decade but the vast majority of those had already been wiped out. And all of those were probably just a fraction of what Microsoft had spent just in this acquisition.

Another crazy deal like this is the EA's buyout, I wonder if it will come through or the investors will eventually realize that they are not going to see their money ever again.