You've got a point there. When I was a kid in the 60's and 70's, nostalgia for the 50's was huge. Not the movies so much as the clothing and the music. Especially, for a rawer kind of rock and roll than the stadium rock that was huge in the 70's.
I am certain that what has been fashionable has changed more than once or twice around. Currently, I believe we're in an 80s kick. We're doing reboots of Halloween (and, yes, the 90s franchise Scream, but I would argue Scream itself plays off nostalgia for 80s slashers), Blade Runner, Alien, and Stranger Things is playing off a lot of Elm Street (and other 80s series'). I believe nostalgia in and of itself is just "in" at the moment, but I think we pull most of all from the 80s. We have a Flash movie coming out that's playing off Tim Burton's Batman.
I wonder what things will look like in the next twenty-something years. They're rebooting Harry Potter and Lord of the Rings, and we saw a new Spider-Man movie that heavily played off the 2000s Spider-Man, so we are already starting to see a changing of the guard, so to speak.