umm I have 8 games in my library well over that amount, none are poorly coded.
you're in the past, textures are big, polygon counts are up. Buy more storage or buy less games, the choice is yours. (or just do indie and old school games)
I'd love to see what the id5 engine could do with 50GB in texture. This would be especially true if they could do a quake remake with the same engine and same amount fo texture packs.
Doom4 is set to be another graphical milestone. Since by then IDTech5 will be fully developed. RAGE is not using IDTech5 with all it's planned capabilities. IDTech5 is being constantly upgraded and that's what's hardest thinks Carmack - because if he makes a change 100 developers are going have to re-calibrate their process and that's the pain if an engine changes messes up a lot of work or makes work inefficient for some time - they're battling with making a high performance experience while still having effective development ... they set RAGE to be fully 60 FPS game.
DOOM4 will be 30 FPS on consoles in singleplayer and 60FPS in Multiplayer - PCs will have no such problem.
The point is with DOOM4 - there will be 3 times as much graphical detail + engine upgrades over RAGE will be fully implemented
Carmack will experiment different electronic toys for RAGE - These patch extensions will bring - Eyefinity support, some kind of ATI Radeon specific support for
memory something(forgot), including Kinect hack - "perfect anti-aliasing" code and "perfect motion blur" code. Completely unsupported stuff that PC people could play with. Remember the old "geo quake" ... that was carmacks technology demo.
If super-quality texture packs are very pupular on the PC - this could influence they'll make even better job for PC with DOOM4.