Metropolis was remade. Osamu Tezuka made an anime version in 2002. It's well done with some changes, the robot is a little girl. It's worth checking out and I'm not even an anime head!
Most Hitchcock should be left alone -- look what happened with "Psycho!" Can't imagine the ignorant audacity in remaking, say, "Vertigo."
Others I can think of that heretofore have not been attempted:
"Casablanca" (other than some half-hearted attempts at referencing the material, there's no real remake).
"All About Eve"
"The Day the Earth Stood Still"
So many.
"Dr. Zhivago" was just remade as a TV mini-series but did not see it. Actually, the original is not Lean's best effort. However, who's around to better it?
"The Producers" is being made as a musical from the Broadway hit. It could actually better the original -- perhaps the director of "Chicago," Rob Marshall could do it justice.
The last "Billy Jack" movie was a remake of "Mr. Smith Goes To Washington". I haven't seen it, but I can only imagine...
