The difference between Sony and MS is console space is that for Sony it is a must win battle and for MS it is a side quest. On the other hand Windows and Enterprise business are the money makers for MS and especially Windows is turning out to a real must win battle. They lost the mobile phones and tablets, and fighting fornthe remains of mobile business with Windows 10 and Surface. Desktop and hard core windows gaming are in long term becoming a niche as most users are drifting towarda mobile. Personally I do not see any reason for building a desktop PC anymore.
So what will MS do if XbX fails commercially. I think they migrate Xbox brand to mobile gaming, with Surface and Win10 and take the battle with Steam. This would fit their strategy better than consoles. I could see MS coming out with statement that "The console is dead, the future is mobile gaming in Windows10-XboxLive-on Surface".
