This will be interesting but not sure how much it'll matter. I'm mixed, as I'm ok with mouse and keyboard or controller for FPS (obviously mouse offers more accuracy although its not "realistic" which I see people tout sometimes, that will take VR/AR advancing). And for non FPS games I strongly prefer controller due to analog movement and ergonomics.
I'm actually more interested on if this means you can use it natively, for like browsing the web. If so, an Xbox One would actually make a good computer for my Mom (where she mostly uses it for Facebook, which you can already plug-in non-Kinect webcams although Kinect would be nice for her and she's been doing video chat with my niece/nephews/sister through Facebook), for when she needs to do some light tasks (like checking out video/pics from her phone on a bigger screen). I haven't checked lately, but if a lot of those casual games (the "find the object" type and similar mobile style games) are on there she'd actually get even more use.
I don't recall, is there multi-tasking much, or maybe even through the HDMI in port (so like Picture in/by Picture type of functionality) where she could play a game while watching Netflix? She'd be sitting pretty close to a good sized display (4K TV), so it being small wouldn't be a huge deal killer and frankly she'd be listening more than watching anyway.
LOL at the rate MS is turning the Xbox console into a full fledge computer, I wouldn't be surprised if we don't see another Xbox console after this generation. They don't really have any exclusives anymore anyways.
They've already slated a next one, but I think its the last real one as they're going to start pushing game streaming big time with the next gen (supposedly will be 2 new Xboxes, with one focused on streaming), so Xbox will likely become a service and won't care what you're running it on (beyond what that means for input). I think Microsoft will keep making hardware but it'll be more like traditional setup with certain parts iterated every year (processor), while others they'll aim for consistency (so say controllers).
The funny thing is, the One was actually way ahead of its time. Remember how people protested over Kinect? And then a few years later "smart speakers" took off like crazy? And if there had been changes made to open up the cable box situation (there was a push to do that), it especially would've looked forward thinking.
Microsoft is smart to leverage a major advantage they have, and game streaming will become the defacto sooner than people expect. It will bring improved graphics even if you're streaming lower res (think how CGI improved even though movies weren't increasing in resolution nearly as quickly). And 5G wireless should bring low enough latency that gaming becomes possible on it. The funny thing is game streaming will actually increase competition too. Sony will (I still find it odd that their IPTV setup was branded Playstation but then its their most recognized sub-brand these days), but Amazon and Google are going in big (Google is having people playtest it now even - Ars had an article where they streamed the new Assassin's Creed, and they remarked that graphically it was above what the PS4/One could do and maybe even the One X - albeit it was still I think 30FPS but I think that's the framerate the game would be at 4K on the One X and 1080p on the One/PS4). Not sure what Apple will do but doubt they sit by, and gaming I think will be a big part of selling AR headsets/glasses.
Nintendo will be able to hold out longer, but even they are moving that direction already. In many ways this actually plays into Nintendo's hands as they can keep focusing on the interface (control scheme) while letting them keep banking on nostalgia (which is easier now). Nintendo's problem is going to be trying to manage the online/social aspects though.