I think that we focus to much on 4k, there are plenty of different resolutions between 1080p and 4k. 4k is four times the resolution of 1080p. It really is a gigantic step.
I'll be really happy if consoles could do 3k/60fps. That would already be awesome. 4k/60fps is just not affordable right now.
But the marketing knows all the sheeps want 4K, so well...