I think this is the "only the hardwood lasts" effect. Someone please come up with a better name. When people think of old music, generally speaking only the top 10% of stuff survives. All the crap sinks to the bottom and no one cares to remember it or put it on the radio today. Then look at all of the crap music today. In 20 years, it will all but be forgotten and people will think that Weezer was the only band in the 90's and 00's (I kid, I kid... though I really do like the =W=)

We have a pair of friends who see all of these dumb comedies in the theatre multiple times and then buy them on Bluray as soon as they come out. They loan them to us, we chuckle at a few jokes, and then they're totally gone. In a couple years, people will have completely forgotten the modern Pink Panther 1/2 and Get Smart movies. But Peter Seller's Pink Panther movies and Get Smart the TV show will live on.

A lot of the movies that come out in any year are really just momentary distractions. The ones that are quality enough to survive will, and in 30 years people will look back at 2009 and think that all of the movies that came out were great (because only the great will have survived) and they will lament that all of the movies coming out in 2039 are teh suck.