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.... ?!!
They pointlessly remake a lot of classic tv and films that cannot be bettered let alone exceded. It is lazy filmaking. ( perhaps not as bad as endless sequels and prequels but too many people queue up for the rubbish and it makes way too much money for the garbage so they keep on pumping the shite out)