All my friends and coworkers did. All except one, but he was out of the country at the time. He said, he won’t be coming back, or if he does, it will just be to close out his apartment and sell his stuff.
A online poll at The Japan Times two days ago (I think) indicates that fully 23% of the foreigners here are going to leave. I think that number will come down as the panic subsides, but I still expect it to be about 10 to 15%.
Good riddance.
You say "good riddance", but given Japan's demographic implosion, is it really a good thing that the immigration flow's gone negative?