You do see that both of your statements are related to each other and are a direct result. Was it the PS4 unveiling last February or was it the legendary TV, TV, TV and Mattrick meltdown in May when the uproar began? Microsoft has a product to sell and invested more than 4 billion Dollars in the last decade to set foot in the market. Every negative PR and especially the dimension this whole affair had, made them ditch their plans. Every outlet, every board, every blog, every retailer had this DRM dilemma as their main topic last summer. Not to mention the tweets and posts per second. Microsoft witnessed the power of the consumers and back pedalled half a year before launch! It is only a secondary effect that many buyers sitting on the fence went with the other system. Again, not Sony made them ditch their plans nor were they responsible that Microsoft came up with the DRM idea. That's not how compeititon works.
Both Sony and MS had their next gen reveal on the same day. Sony got great reactions, MS got bad reactions.
MS learned that the public favored the PS4 model over theirs, which made them get rid of the DRM stuff at first, the mandatory kinect later.
You are telling me it had all nothing to do with Sony and the PS4 doing so well?
Implementing stuff that works well for the competitors and learning/stealing from them is exactly how competition works.
Of course you are right that PC, Wii and mobile are out there too. But does Mercedes really care how the S-Class is doing compared to the Hummer H3?
I guess they are only looking at Audi A8 or BMW 7 sales. That is the relevant segment.
So MS and Sony don't really compete with Steam, Wii U because X1 and PS4 are in their own "HD-AAA games-Media-400" segment.