Sort of.
I think 3e and 4e cater to very different people. I've been dissatisfied with 3.5 for going on 2 years, now. I've continued to run it for the story we'd started, but did so knowing I was unlikely to run another 3e game after this one. Something I discovered is that, while I'm pretty good at digesting rules and developing "system mastery", I don't actually enjoy it, anymore. Most of my group is also pretty crappy about system mastery. Two of the players all but refuse to crack a book unless given page numbers. For clarification, I don't have a problem with that and the players are active at the table. But, the added workload falls on me, as DM, at least in part. Really, only one of the players at the table is both interested and good at system mastery, and I see a huge drag on the speed of play.
On the other hand, that one player who is good at and enjoys system mastery is also (understandably) pretty happy with 3e. So, you end up with the two of us with incompatible desires and the rest of the group just trying to figure out which way to go.
One other interesting thing that the 3e/4e transition has made apparent is that some people (like me) like to try new systems and find the idea of being stuck with only one to be a bit constraining, while others want to find a system with which they are happy, stick with it, and stop looking at others, evermore.