I agree that some shots from 2001 don't hold up as well today as they did in 1968, but the film remains a classic, and in my mind, no remastering could improve upon Kubrick's vision.
The only shots that don't really "hold up" in 2001
are the acid trip shots between the "Star Gate" sequence and the bedroom sequence. Those
Everything else, including the Moon-having-Earth-gravity-which-they-really-couldn't-avoid-without-twice-the-budget shots, hold up really well, and shine like a star in most HD broadcasts I've seen as of late.