I don't know. I wonder on the other hand, if it wouldn't take a scarily short while for Earth to revert to being the only normality, if that makes sense. (It's not the same thing of course, but I can remember coming back from Uganda years ago, and getting a sort of reverse culture-shock, but it was only about three days before it was all back to normal). It could go either way, I suppose. I tell you what, how about we volunteer for TARDIS travel in a controlled experiment to find out? It would be a selfless sacrifice on our part, of course... :-D)