A Porky's remake with a "body positive" shower scene perhaps?
An Airplane! Remake would have to cut out all the ethnic stereotype jokes, the "do you like movies with Gladiators" scene, and perhaps the scene where everyone who listens to Robert Hays committs suicide out of boredom.
My point wasn't that you can't remake 80's comedies or do college sex comedies today- it was that some of those films represent an age gone by in what the public will accept. I just think that is really interesting since movies are somewhat of a snapshot of the period in which they were produced. Some of those movies can be updated for the times, some cannot. Maybe that's a good thing.
Airplane had ethnic stereotype jokes in it, but they weren't the main draw of the movie. I think the Leslie Nielson style of prop driven physical dumb guy humor could be popular again. Right now the comedy market is pretty saturated with the opposite, conversational political humor that a lot of people are getting tired of.
The fraternity kind of humor would be more difficult to modernize, I agree, but it's not like immature sex humor is gone from today's comedies. It'd just have to look more like the kind you see in things like Superbad or The Hangover.