The way the Ori dev is talking seems more like Scorpio feels like MS is entering a new gen by platform development. Right now devs would have to develop for X1 and then for PC but with the release of Scorpio devs will be able to develop for UWP which will be very scalable from X1 to Scorpio to PC. I don't think they meant that Scorpio is a new gen in spec.
Also I don't think we should compare potential Scorpio sales to PS4Pro sales. Sony is on a roll since the gen has started. They sell a lot and X1 not so much outside USA. Releasing PS4Pro didn't give people any reason to jump in any more than they are jumping in on right now. But in the case of Scorpio I see it differently. A lot of people just hated the X1 and refuse to get an Xbox even if they likes some of the games available for it. I think Scorpio has the opportunity to get those on the fence in. Also some that only have a PS4 might see a reason to finally get an Xbox.
People on forums like to pretend that because Xbox games also release on PC no one will be interested in Xbox but I believe that's just wishful thinking. When they'll see the most powerful console on the market running the new COD, Star Wars, Forza, Halo and RDR2, with a UBR and HDR I think Xbox will offer better competition then. I don't think they'll get as competitive as 360 was in EU but I think it might put more faith in gamers around the world,











