I agree, you cant remake the Rocky Horror Picture Show. What would be the point in redoing something great? Especially redoing something that people still watch, love, and know the original?
Some remakes are good - I prefer the remake of the Thomas Crown Affair to the original - but most are just a 'jump on the bandwagon'. How could they remake Oceans 11 (12, 13, 72 etc), Italian Job, Rocky Horror.... ?!!