I refuse to upgrade just because Gavin says it should be so. Let the actual market decide, in terms of fees and such. I detest centralized decision making - and frankly have some suspicions about Gavin ever since he caved in to meet with the CIA.
I've seem Mike and Gavin making a serious effort to take network to the next level, with information and real solutions, I've always took special interest in Gavin's opinions, not only because he is highly skilled but above all he was selected by Satoshi himself.
I've not seem the same thing from the other side of the debate, nor rebuttals to Mike's and Gavin's proposals.
Running Core or XT is precisely the actual market deciding...