I don't know if I am making the switch. When I first hear about I was fairly sure I would. I like a lot of the ideas they are shooting for in 4e. I doubt I'll run a 3.x game again I'd run basic before that, unless everyone was clamoring for it. My current group has a I never even wanted to give 3x a shot type, its all about basic D&D, so he will play 3x only because that is what everyone else is playing so I doubt ill get overwhelmed with 3e requests. I'd play it in a second, the rules of a RPG have rarely detracted from my enjoyment as a player.
Don't know why but what I really want to run is earthdawn. I haven't played it in years and now I want to run that, maybe I'll see if I can run a earthdawn game using 4e rules. So if after years of it being on the shelf now I'm enthused about it, why would I say never to 3.x or get rid of the books. Sure right now I got no desire to run a game of it, but 5 years from now I may really want to run it.