I agree and completely comprehend all of what you're saying...
I guess, for me it's a hard sell because the reality is I don't want to play games on PC. I've been looking into it recently, if I wanted to I could get a beefy PC without too much issue. I just don't want to, it doesn't appeal to me anymore.
I guess the next Xbox could be a little dongle in the TV. And that could definitely work (and I'd buy it). It just depends on whether VR and suchlike kick off. If they do, that dongle device is screwed.
Edit: just to clarify, it'd be screwed because of huge latency issues.
It might be as simple that going forward they expect more surface level devices that will help become their 'baseline' for performance going forward. I'm not entirely sure on the 'how' as you write. I just know that:
a) despite how well PS4 and Xbox One are selling I largely suspect that both Sony, Nintendo and MS know that the market has shrunk as a result of mobile gaming. So while today it's still charting well, it does not imply it will keep this rate up over the life of the generation. So last gen was 80+ million devices, maybe it's now going to be 70, or 60 million devices, or maybe if you look at the collective pie: Wii + X360 + PS3 = total hardware sales will drop considerably, and the pie is now fixed and shrinking. (and we equally see both PC and Mobile back on the rise for instance).
b) there might be away to get you to the W10 ecosystem without you needing to buy a console, perhaps the battle for the living room is over, as in the winner of the living room, and dinner table, are family members looking down at their phones. So what if I could convince you that your future console is your phone, tablet, or hybrid device
Continuum is already here. But in 5 years where is continuum? Surface book has a dockable GPU, that should fit very well with explicit Multi-Adaptor for DX12 games in the near future.
All you'd have to do is wire it up to your large screen TV. The wireless dongle may or may not be built into the device, but there is a USB port for that. The future is coming! For big screen big power gaming, there will always be a niche market for that, but at least this time they won't be left out, like how they were when MS went the console route.
heh, in the worst case scenario, lets talk about Surface Hub. The large ass TV screen that supports multitouch, gestures, pen, etc. What if that was the new W10 living room device. Supports high quality gaming as well. MS has a lot of different devices to pivot to.