If there ever was a movie that DIDN'T need a remake, it'd be Rocky Horror... horror remakes, however uninspired and unnecessary they may be, don't really bother me that much. Horror will never go out of style, the basic principles and scare techniques are primal. But something like 'Rocky Horror' is going to be a lot harder to adapt to modern mentalities... there's nothing special about transvestites today, aliens, or bi-curious madmen.
Well, they could maybe make it a bit more dark and gloomy - like the style of the nurses from the Silent Hill movie.
As long as they don't try to make it more humorous, because that WILL fail.
What's next? Apocalypse Now the remake? Natural Born Killers? Fear and Loathing in Las Vegas?