I personally think it's hilarious when people say the textures look bad. It's equally hilarious when the devs say that higher resolution textures would go unnoticed though.

It shouldn't be difficult for them to output higher resolution textures from their original assets and repackage them as an option. It would add several GB to the file size of the game, which might be a concern for them for one reason or another. They might also employ some artists who work in native resolution, which would make such an endeavor much more work than it needs to be. Hopefully they weren't so short sighted.

I don't expect them to even think about doing this until DX11, and the lighting improvements will probably be more significant, but I'd like them to at least consider it more than a null improvement. People with PCs to handle it (probably well over half of PC users) would almost unanimously want the higher resolution textures, so why not?