Yep, probably that will be the future of xbox, it will become like steam so you can use and play your xbox library on every device. There may be some Microsoft branded Xboxes, like they have the "surface" PCs, but will be just another device that runs the xbox client.
Well... they want that, but aren't there from my point of view.
From the xbox library (including 3rd party games you got on xbox, old 360 games and so on) only a handful of titles are actually playable on pc, around 10% in my experience (those labeled as "play anywhere", mostly "newish" first party games... 3rd parties want to sell you another copy to play on pc even using the xbox pc client).
And the look and feel of "the platform" is quite different on pc than the console, i think they will try to make the whole library playable and have the same experience (booting up directly to it or running it as a client on any supported device, similar to steam big picture mode)
Currently if I'm filtering right; 553 games are 'free' under Game Pass Ultimate currently, 223 are available on PC. ~42%. That's not great; but not horrible either.
Full Game Pass is 331,461 titles currently, and 240,596 installable on PC; so a bit better ratio.
Yeah, i'm taking as base my own library of xbox games, built over many years. Most games i bought digitally for xbox.
Probably for gamepass they select games that can be used on pc and console, and the store has xbox and pc versions of many titles, but that doesn't mean that if you bought the xbox version you have rights over the pc version.
That is my guess too, they will still release both a console and a portable but it will be open. Phil Spencer has also talked about allowing third party stores on these future Xbox consoles.
Yep, users try to consolidate their gaming library in a particular platform. If you have 100 games on steam, why you would get the newest fifa-718 on xbox instead of steam, where you have all your games?
They plan game pass to get users to the xbox ecosystem, but i'm not sure if it will be enough.