"Maybe" was my best answer. I have no interest in migrating rulesets again, but I could be persuaded by the right set. I pretty much want 95%+ compatibility or a wholesale update that fixes a lot of things. The former would allow me to continue to use things like the Adventure Paths, Tome of Magic, etc. The latter could bring the game more in line with the feel I want.
Odds are, though, that I'm not going to switch -- at least not for a while. There's just too much stuff I can do with 3E still. If I abandon 3E, it'll probably either be for Fantasy Hero (which is starting to look less complex and more customizable than d20) or World of Darkness (as some of my players have been interested in trying the nWoD for a while).