I really dont care about file sizes at this point to be honest, give me uncompressed 24 bit FLAC audio and 16k textures for all I care. I just want games to move back towards systems based games. My biggest problem with fallout 4 (just as an example) was the lack of actual RPG systems, conversations had very minimal effects on how the game would play out, your choices had very limited consequences, and no matter what there was always a path forward. Whatever happened to real RPGs where if you mouthed off the wrong NPC your entire quest is now F'd and you either start over with a fresh character, or move on to something else.
I digress, but file sizes aren't anywhere close to the top of the list in my concerns for modern games.