an option yes. however people have tried to make "high res" textures by stretching existing lfs textures, and attempting to add more detail to them, which IMO didn't really make much of a difference.
so essentially, all textures would have to be created from scratch. i love the texture/artistic style that eric uses, it's what makes LFS what it is! I browse through threads where people offer new tarmac textures, and I look at the screenshots and always cringe - what one person considers to be an improvement i see it as several steps backwards - and that was just a tarmac change!
also another thing, when playing GTR 1/2 with its super high res tarmac & grass textures, i get this weird morphing effect that happens once you reach a certain speed, it almost looks like they start running backwards! must be to do with frame rate or whatever, but i certainly don't get that effect with lfs's textures!