My group is largely limited by the economics of it. I know 2 players will strongly resist the change, just because it will cost so much. (Yep, even a $40 one-time purchase makes them leery.) So I'm not entirely convinced we'll change.
Likewise, no where has it been proved to me that I need 4e. About the only thing I've read that I like is some of the fluff, and that I can do on my own in 3.5e.
That all being said, I'm a freelancer. I want to freelance more, so I might buy it, learn it and write about it. ... Or I could just write for one of the other ten systems I know.