Their recent decisions seem to indicate this move. The past couple days we've seen the acquistion of Mojang, introduction of a PC controller, and plans to stream Xbox 360 and One content on PCs. I can see Microsoft creating, relatively, cheap gaming PCs ($499) bundled with an Xbox One PC controller in a few years. Access to Steam, Origin, and a new Microsoft alternative gives an instantaneous game library.
I think this would be a brilliant decision and set Microsoft up for great success.
"On my business card I am a corporate president. In my mind I am a game developer. But in my heart I am a gamer." - Satoru Iwata