Oh, the horrors of seeing Marty having to use a map, having to look Doc's name up in the phone book and then having to actually talk to him instead of texting, having to let an attendant pump his gas and then having to decide if he wants regular or unleaded, forced to listen to what's playing on TV or the car radio, oh the humanity!
Yup, the "future" of 2013 is pretty boring.
New Star Trek movies are still produced and they still feature Khan as the villain (although portrayed by a different actor.. at least Leonard Nimoy does his obligatory cameo in each movie). New Star Wars movies are also being produced and the next ones are probably gonna re-unite the cast from the original films.
And in 2010, a sequel to TRON was released, again featuring Jeff Bridges and Bruce Boxleitner.
If we try to compare this to the 1955/1985 gap... that's almost like they had done a sequel to Forbidden Planet in 1985, directed by Steven Spielberg and starring Leslie Nielsen!
(All of this makes the "Jaws 19" joke from BTTF II seem not so far-fetched anymore... they just picked the wrong franchise.)
Other than using the original cast there were plenty of remakes back then. For SF/F off the top of my head there was:
The Thing(82/51)
The Fly(86/58)
Godzilla(84/54)
Invasion of the Body Snatchers(78/56)
The Blob(88/58)
2010(84)/2001(68) (though only a 16 year gap...)
Invaders from Mars(86/53)
Not of this Earth(88/57)
Arguable
Alien(79) vs It! The Terror From Beyond Space(58)
Flash Gordon(80/36)
Buck Rogers(79/59)