But, compute based raster view geometry is already maxxed out. A PS5 can do UE5's version at 1440p in a just a handful of ms, mesh shaders shouldn't be much different. RDNA2 and Ampere both, assuming you've got the card to resolution ratio right, are already at about 1 triangle per pixel. And with modern mesh filtering you don't need anymore.
What's needed, what's going to be scaleable, is raytracing performance and memory bandwidth and etc. Sure you can get a 3090 to run Doom Eternal at 8k *now*, a super heavily optimized last gen 60 fps target game. And as soon as next gen starts getting targeted, well then goodbye 8k. Certainly shouldn't work once Eternal's promised "next gen" upgrade arrives.
I just don't see it as a balanced, scaleable arch. The die sizes alone don't fit, those are huge. If I were Nvidia I'd want to sell those dies to professionals at twice the price. You want a new 4k+ video rendering card, fork it over.