Any game with texture pop-in is already handling more data than you have space. “Rage” famously had unique textures across the entire world… and infamously streamed them from DVD, with the dumbest logic for loading and unloading. You could wait for everything to load, turn around, and it would all be blurry again.

Anyway if you’re rendering ten zillion copies of something way out in the distance, those can all be the same. It will not matter whether they’re high-res or unique when they’re eight pixels across. As Nvidia said: if you’re not cheating, you’re just not trying.