If Sony were to try to match Scorpio, does anybody really think they'll even be able to make holiday 2017, let alone Spring 2017? They might be able to upclock a tiny bit as the XBox One did for the CPU but that's extent of it unless they go for a big redesign. MS is put themselves out there by revealing the specs so they're confident that Scorpio will be the most powerful console when it launches. Why are people having a hard time believing this?
As for cross-compatibility, I'm disappointed if MS will mandate this for the life of Scorpio. To me, the best way to handle it is to gradually grow exclusive Scorpio only games as the user base grows. First year, none, second year, a few, third year, more, etc. That's a gradual transition and gives Scorpio owners something to really look forward to (games fully targeting 6 TFLOPS) without completely alienating XBO users.