Well, 3E won't die, thanks to the OGL. When 4E hits, if there's any warning at all, we'll see the SRD cleaned up, a non-WotC advancement table added, probably some counterparts to the IP creatures and gods added and on sale at the same time.
Unless 4E is very different from what Eric heard, when the Fork comes, I'm taking the OGL/3E path instead. All of my books remain good, my campaigns continue without much of a hitch and, since it's all OGL material, it'll remain in print in some form forever.