I agree, I could see more Back to the Future movies (but you'd have to replace Michael J. Fox as Mary McFly, and get a new Dr. Brown, which would be hard to do).
I could also see more Aliens movies, and more Predator movies. And more Aliens v. Predators is good too.
Also I could go for more Avengers and Iron Mens. However, I could do without this current Spider Man. Also Ben Affleck as Batman is not doing it for me.
Another Jaws killer shark movie would be good timing about now.
And of course I can never get enough zombie movies. The Return of the Living Dead (not Romero) series is ready for another installment (last one was in early '90's). Night of the Living Dead which is George Romero, which is the original zombie classic, can be remade another 10 times, and I would see them all. Or Day of the Dead, or Day After the Dead, or w/e.