What will Microsoft do to counter PS4 Pro exactly? Do some marketing years before the launch of Scorpio to remember people not to buy the Pro and wait more than a year? Won't work.
The difference will not be so obvious, graphically speaking. They rather make some publicity of Xbox One S advantages: 4k bluray, retrocompatibility, etc. But all Sony has to do is keep pushing their exclusives and they win again.
3DS, Wii, PSP, Vita, PS2, PS3, PS4 & Steam.