A future PS5 Pro solves that issue. By the time Sony is ready to show something like that off, the PS5's incredible decompression capabilities will still be relevant. Base hardware storage performance, more than likely, won't be holding back far future titles. It's much easier at that point to beef up GPU, CPU, and RAM. Could be wrong on this take I guess but I think Sony made the right hardware choice by putting most of their eggs in that basket. If you're gonna "future proof" anything, it may as well be how developers are going to handle assets from storage to RAM.
Edit: I'd like to add a PS5 Pro could, in theory, absolutely stomp all over a base PS5. When you consider the revolutionary jump to multi-chip modules and 3-D stacking, a PS5 Pro could be very close to what would be considered a true next-gen upgrade. I guess we'll see, though.