I personally feel that Lucas should be able to make any changes he likes to the films. He holds the rights to them, fine, they're his. Let him do what he will.
But let us choose. Let us choose which version we want to watch - and make them all of equal quality (in terms of video and sound quality).
Take Ridley Scott. Almost as famous as Lucas for going back and changing his films to fix what he considered mistakes. But when he says "Hey guys so I've just changed Blade Runner again!" he then says "BUT here are all five different versions, all restored, all in HD, so you can pick exactly which one you want to watch and ignore my version if you like."
Unlike Lucas who just sticks his fingers in his ears and screams "THERE'S ONLY ONE TRUE VERSION LA LA LA LA LA".