There's lots of awesome BTTF movie ideas that *could* be attempted, but you just know if anyone actually tried it would be awful.
Maybe if the new starwars movie turns out to be awesome i might have a little faith that JJ Abrams could do something with BTTF that wouldnt suck. He did a good job with star trek imho
But i don't subscribe to the fact that remaking something somehow ruins the original, no matter how terrible the remake is.