Obviously, as we are now seeing. Practically everyone else will to, it's Stallman's lead.
We are? Stallman is pretty adamant about the code signing thing, and so is Linux 180 degrees opposite. It's a deal breaker if it gets left in.
Remember, we have two opposing views here: religious and practical. Linus used GPL2 because it could be used in a practical sense if the licensor wants to. So far GPL3 appears to be designed around a religious POV, incompatible with Linus' practical desires.
It all depends on how much Stallman will budge. From what I've seen of him, he'd have no problems with the flagship GPL product not using the GPL3. He's the "Okay, I'll take may candy and go home" type of person.