I'm all in favor of a higher frame rate over graphics if a choice must be made. But that is something that I consider when playing on this generation of machines. I find it a little concerning when they make that statement cause it implies (and I hope I'm wrong) that "our system while more powerful is not going to be that much more powerful, therefore we need to assign a priority between frame rate and graphics.
I would imagine next gen should be capable of 4K60 at all times. But if a choice must be made I'd be ok with 1080p 60fps as 1080p is actually good (No once can honestly say: I can't see details on this 1080p picture)
But if 1080p then I will not accept a single drop in frame rate, whereas an occasional frame rate drop on 2160p could be forgiven (No more than occasional though).
He who has nothing to hide does not deserve to be called an individual.
Capitalism has convinced people to buy stuff they don't need with money they don't have to impress people who don't give a shit. (George Carlin)