Here's the problem:
A console can only, at max, cost around $500. So it will never have the best graphical capabilities. It'll have the most cost effective chip that can be easily mass produced.
If you're into PC gaming you can see the future basically. There is cards out right now that blow the XBOX1 and PS4 out of the water, and neither console has shipped....hell, there is probably cards from a year ago that could do that. So we already know the max potential of this gen before it even starts. The same could be said for last gen.
What's funny is, like I said, a few of us called this shyt a long time ago. Why? Because we've kept track of PC gaming.
As far as 4K, no. That shyt will never be mainstream for a couple reasons. First off, cost. This ain't an HDTV selling for $3000 back in 1998, when nobody had them. These 4K sets sell for $20,000, the smallest ones sell for $5,000. By the time these things catch on, digital distribution will have more of a foothold than it already does, and nobody is going to download 4K files with capped bandwidth and throttled internet. One 4K movie is around 500 GB.
Besides, most next gen games don't even run in 1080p. If you think they're gonna run in 4K any time soon you're gonna be severely disappointed.
Fred.