I don't think Sony is going to give up that easily, nor is Nintendo or Valve.

Microsoft has tried, with sheer force of capital to buy out these players and couldn't understand when they were denied. In tech you can do big mergers and acquisitions with sheer capital but Nintendo is a pride and joy crown jewel of Japanese industry, and no amount of money would allow MS to buy them.

MS' big push for accessibility and cloud gaming makes them ultimately platform agnostic over time, because they are leveraging the cloud technology to deploy their catalogue on any machine with an internet connection and a screen.

"Classic" Microsoft, the EEE (envelop, extend, extinguish) strategy that made them assholes through the 90s and early aughts hasn't been nearly as prevalent in the current Nadella era. More often than not MS has been forking open source projects or simply contributing to them in their own ways rather than building proprietary systems.