Hmm...
I'm not sure I agree with that. I don't think CGI is to blame for the quality of remakes. My problem with CGI is where it's used to pull off something that couldn't be done for real. I'd have no problem at if they'd used CGI snakes and rats in an Indy film - providing they were realistic. If CGI is doing its job, then you shouldn't really notice it, in my opinion.
The problems with remakes are legion.
I think the biggest is the nostalgia factor. They never remake flops (unless they're "cult" flops) so inevitably the original film will have a senitmental place in the hearts of its fans. Even if the remake would be considered a better film by any objective critic, fans of the original are usually more than a little biased so it's tough for the remake to live up to their expectations.
Then there's the question of whether to do a "faithful" remake, a "modernisation" or a "reimagining".
The Anne Heche/Vince Vaughan Psycho was a faithful remake - frame by frame. Which begs the question "Why bother?" Why fix something which wasn't broken? Of course, the original brilliance of Psycho was in the fact that Hitchcock completely mislead the audience for half the film, drawing them in to believe that Janet Leigh's embezzlement was the central plot. When she was disposed of, it was completely unexpected. These days, though, everyone connects Psycho with "the shower scene" so whereas Hitchcock produced suspence, Gus Van Sant's remake could only manage impatient anticipation.
With a "reimagining" there's often no real resemblance between the original and the remake beyond the name. It's just a case of trading on an established name to sucker the public - and most of them end up feeling like it too.
Modernisations can work, though, if done with a bit of sensitivity. The Thomas Crown Affair springs to mind. It may be as good as the original or it may not - it's a matter of opinion and, I'd guess, generation - but it's certainly not a travesty.