It's an idiotic move by microsoft as is (unless they twink it). I doubt that the vast majority of PC gamers would touch those xbox games. Mainly because of the windows store and no mod support. If MS really wanted to "open up it's games to a broader audience", it would put their games on steam and allow mod support.
What will most likely happen is anyone who owns/plays on a gaming pc who wants to play any xbox game has no reason to buy the xbox consoles so they won't, they'll just buy whatever xbox game off of windows store and any third party game off of steam. All MS is really doing is losing potential console buyers (who would will likely pay for xbox live, buy third party games for the platform, buy content from the store) for a some windows store purchases on pc.
