Scorpio sounds a lot like a device targeting US and UK market and a narrow segment of gamers (but I suspect a very lucrative one) to me while also placing them to gain any VR console customers should VR truly prove popular.
Their move on PC allows access to broader global market than they've ever reached via console, the PC VR market and more general gamers (to be blunt if bet MS would rather sell popular mobile game numbers via W10 store on laptops and PC's than 5million console units sales with huge development budget).
We'll see but I believe MS is about to officially change their play in the market and the demographic they're going to focus on.
I definitely feel they still are going to go for the same core gaming demographic but it's definitely obvious as to what they want to do to make Xbox franchises more popular worldwide (at least in my opinion).
I agree with you when it comes to the userbase that the Scorpio is targeting because people outside of North America and the U.K. pretty much haven't had huge interest in the Xbox brand since it started more than 15 years ago. It would be a waste of time/effort in trying to get them via another console so brining games to a platform that many of them already have (PC) should help.
NPD stats show that the majority of current gen console gamers couldn't care less about games being available to play on PC so I don't think the PC push is going to cause any notable bad impacts to the Xbox brand in North America. As long as shooters and sports are on the Scorpio then the Scorpio should get pretty solid sales/response in North America.