You would be surprised honestly ... bands like dredg, Coheed and Cambria, The Mars Volta, Porcupine Tree, Tool, Radiohead, etc getting/already being popular I know many kids that are getting into the classic prog bands.
Now mind you I'm more apt to listen to modern bands like the ones I named, mostly because the 60s and 70s prog scene is so saturated with rip off bands. Mind you there are still some killer bands, King Crimson and Rush being two of the best, just I like the fact that newer bands are innovating much more.