If you publish UWP you can push to mutiple platforms such as PC, Xbox, Gamepass and xCloud. xCloud can be used with Gamepass also. xCloud also allows the ability to stream to Andoid, iOS, and possibly the Switch according to the Rumors. In theory xCloud could potentially get pushed to new TV's, Xbox One, Xbox Stream Stick(Rumored), Fire TV, so on and so forth. So really, if you buy Xbox games, you could essentially play anywhere. Just like netflix and their exclusive shows, the same could come to Xbox with their exclusive games. All you would have to do is connect your Xbox One controller that's Bluetooth to any one of the previously mentioned devices.
That being said, you've opened doors for publishers and got them in places where they weren't before which makes them money.
I think you changed the nature of my comment into an even broader discussion, but I will try to address, but we're probably getting into no land's land as far as the topic of the thread.
The particular comment you quoted was addressing why would a big pub/dev target the Xbox Two because you're basically targeting the Store now going forward - more or less. I admit, they can target Store/UWP today and use UWP, but this has been generally rejected by devs/pubs/gamers which was the point - nobody cares for it. The rest is just you hashing Microsoft's strategy i.e. Da Cloud, which is really just a copying of the other game streaming services that have come before and is more or less PS Now which has been around for nearly 5 years now. That to me is kind of separate from my point, which is they have basically destroyed the Xbox as a hardware and to me are basically left the market, generally speaking.
The large developers or publishers might put a few titles in some type of streaming service, but they'll just make their own service if game streaming took off (or could be profitable, which I doubt), which I doubt it will, but if it did, they'll just pull their titles and put on their own service i.e. the new game launcher or with existing launchers. Either way, not sure why pubs/devs would target Xbox going forward, as Microsoft is more or less abandoning that traditional closed device market. As far as the Microsoft Store, dead man walking. imo, just like Games for Windows Live.
Xbox as a Platform to me is stupid (and is a separate topic), but time will tell, as there is really no reason for the big guys to use the Platform as they can easily develop their own and actually already have existing customers on their own game launchers. Again, I have no idea what the large pubs/devs would target either the MS Store, the Xbox Two or their Xbox as a Platform, generally speaking. We'll see how it plays out, I expect this to turn out poorly for Microsoft but some of this is way beyond the topic. Again, this discussion is based on some of the recent rumors being true, which we don't know if they are.
I believe they have basically abandoned the Xbox in the traditional sense, and I actually think we agree on that, in part. Where I believe we disagree is the Microsoft - all the devs/publs already have a distribution model for reaching people on Windows outside of the Xbox console, why come back to the MS Store now?