This is kind've my point actually.
You say that as if 4k 60 will be any easier.
My point is they should use 2560x1440 to get more frames instead of sacrificing frames so they can say it's 4k.
And I just beat Witcher 3 at 1440 on my 2070 and got between 80-100 fps in my play through on high.
But yea you are kind've arguing the same point as me. That hardware isn't strong enough to focus on 4k, so we should focus on maximizing framerate on 2k.
The difference in fidelity to the naked eye between 2k and 4k imo is not worth the sacrifice in framerate given the strength of available hardware.
Not to mention I have a feeling these companies aiming for 4k 60fps are really going to be more like 4k 45fps as they target 60 but fail half the time.
3080ti will be able to do 4k 60 with next gen games, and run current gen games at 120 at 4k