Agreed. Will be a massive jump over base systems.
As for MS. In reality, it will just be like developers making with high end PC's and ssds in mind but at the same time still being able to run on lesser machines. That seems to be the direction MS is going in with Scarlett. It's worked for decades on PC.
PC minimum requirements keep creeping up though - and maybe I'm wrong on this, but it feels like console transitions are a good help to push minimum requirements along periodically.
It would be 'new' to have a platform holder basically maintaining an unchanged minimum requirement for very long once a new generation arrives - and basically could be a bit of a disruption to what previously has happened to PC min requirements, if the industry in general followed that model.
The question will be, how everyone else trends.
I'm personally hopeful the rest of the industry will, over a relatively normal transition period, tick-tock up to the next generation of consoles as a minimum. I think MS will be forced to eventually too. It's fine to say 'lets support XB1 indefinitely' if you believe games and game development don't need anything more than a XB1 can afford at their core, but I think it's a slightly big statement to make.
(I appreciate I'm paraphrasing what MS has suggested in the above - but
if that is their strategy, to keep XB1 as their baseline indefinitely or for longer than traditional in a transition, and we're not just misinterpreting them, then all these questions arise).