In the run up to announcing a huge decision such as banning mixers, I would be surprised if theymos did not foresee traffic at other forums increasing. As this forum has signature campaign participants earning more than elsewhere, he would not have to contemplate less posts being made here but would surely have accepted the inevitable changes at other forums.
I'm sure that Theymos is well aware that the traffic is being moved elsewhere in fact that's the whole reason he banned them in the first place. I don't think this change really has any negative affects whatsoever except for the folks that were in those camps. I also don't see casino camps getting the boot anytime soon as gambling is perfectly legal in most countries and more in particular the SEC isn't as strict on those.