Personally, looking at the graphics in Lego City Undercover (an exemple), they look pretty darn good for what it is. Then, again, it may not be using the WiiU at full capacity graphic-wise but, still, it looks great. I'm not a graphics whore: I'm not looking for top notch graphics with the best physics ever, etc, etc, etc. As long as it looks good and not an half-assed job, whatever resolution (depends on the game console generation here), I'll be happy.
A 4k console? In your dreams... for now. Even a the nVidia GeForce GTX Titan can't even run a game full quality at 4k at a decent framerate. And, that's the most powerful single-GPU on the market (at 1000$ a pop). In Unigine, in 2560x1600, it only gets ~45fps. Note that UltraHD (aka 4k) is 7680x4320. How would you plan to make a console, at this present date, when the most power single-GPU card on the market can't even run something smooth in 2560x1600 in a GPU Benchmark software? And how UltraHD TVs are crazy expensive? Tell me about it.
Now, I also know that you are hypothetical here.
Ultra HD (UHD) is a label for 4K and 8K compatible televisions.
4K UHDTV actually has a resolution of 3840 × 2160 (2160p), 4 times the pixels of 1920 × 1080.
8K UHDTV has a resolution of 7680 × 4320 (4320p), 16 times the pixels of current 1080p HDTV,
