If you're going by Mark Cerny, doubling the CU count may no happen based on what he said in Road to PS5.
"Also, it's easier to fully use 36CUs in parallel than it is to fully use 48CUs. When triangles are small, it's much harder to fill all those CUs with useful work."
Another thing we must understand, is what AMD RT performance is.
In RDNA 3, RT only got a 50% performance increase per CU.
Ai upscaling maybe is what defines PS5 vs PS5 Pro.
A PS5 Pro would be great, but the devs really needs to step up their optimizations, that's the problem.
Remember, this game is running on Jaguar CPUs and a 1.84 TFLOP GCN GPU.
PS5 on it's own is powerful enough to pull through this generation.