I don't agree with Buzz Dixon. Just because HE'S been blessed with a timeframe that allowed him to see every Bugs Bunny and Laurel & Hardy & other "fossils" doesn't mean everyone else has. People die, but people are also born, so there's always a first time for them to watch something and like it, whether or not it's the next big thing.
Does he think everybody's seen Casablanca?
Does he think everybody knows about Martin & Lewis?
Does he think everybody knows Bugs Bunny's square dance by heart (from "Hilbilly Hare")?
Does he think none of my customers laugh when I blurt out Abbott & Costello jokes?
And sure, Mel Blanc, Jim Henson, Chuck Jones, Walt Disney, and others are gone, but there will always be exceptional/unique people in the future.
Timeless classics, indeed... in fact, I just remembered one...
CLEEEEEEEK! 
