I dont' think they should remake crap films. I think they should take some of the great films or ideas that could benefit from the advancements in film technology, effects, etc...Or the small cult films that never got the big budgets they deserved or would recieve today. Not all but certain ones. I think Clash of the Titans, Escape from NY, Dirty Dozen, and Fantastic Voyage are good examples of this. Other reasons for remakes are perhaps a great foregin film turned into a US film like The Host, The Ring, etc...
I always want to see original films but at the same time a remake of a film that deserves one is always welcome by me. I think some are not needed like The Thing, Total Recall, Big Trouble in Little China, Blade Runner, Alien, Star Wars, ET, etc...Too soon.