I think you are way off with these. 4-5 years from now 4K TVs and monitors will have very significant market presence. The volumes are already ramping up quickly. The prices are already plummeted of what they were a year ago. The manufacturing of TV panels, especially 50" and over will just transition to 4K production in a relatively short order and it wont take too long before everything but the lower end new TVs will be using 4K panels.
Even if they have a significant market presence of new sets sold, you'll still have a gigantic install base of 1080P sets in people homes for years after.
And I dont know of a single affordable 4K
TV. I've heard of a few decent sounding monitors coming right now, like an Asus and that Samsung, for probably $600-$800, which is still pretty cheap. Ignoring those cheap Seiki's. Even those Asus/Samsung monitors sound like the first 4K stuff that you'd actually want (single panel, 60 hz supporting, etc). That's how early this stuff is, they're literally still sorting the basics out, not ready for prime time yet.
Again you're looking at years to get significant in home penetration, if then, by which time current gen will be winding down anyway, as predicted leaving it a problem to be addressed by the next gen.
4K is 4 times the resolution of 1080P, while 8K is 16 times the resolution of 1080P, or 4 times the res of 4K.
Forgetting 8k, 480P (well, Ps2 only did half that didn't it?)>720P ~3x, 720>1080 ~2x...that's the biggest pixel jump yet. And it will soak up 4X of whatever 8-10X multiplier we usually look at in console transitions. It's kind of discouraging how all these res increases sap our power. But I guess, that's kind of the point of res increases, they are supposed to give better returns than using that power somewhere else.
Tangent, for 10X power we'll be looking at 13-18 teraflops. Do we see that being feasible as mid range PC GPU's in 2019-20? I suppose so...then again this gen didn't strictly deliver 10X flops either. More like 5X-8X depending how many flops you rate Xenos/RSX. If you rate RSX ~250 GFLOP, then PS4 delivered ~7.4X. Multiply that by low end current gen 1.3 TF ~10 TF. Which, R9 290X=5.6 TF. So I guess you could say, that dual R9 290X is next-gen now
Somehow, the way this gen went pretty mild in terms of power, and how it's all about environmentalism and low power use these days, I have doubts whether we really get even 10+ TF next gen, but we'll see.
I also wonder if we'll get a lot of 1080 upscale nicely to 4K too, next gen, if the visual returns work out better that way, and/or if next gen doesn't deliver enough power again.