Jewish culture (or possibly Jewish culture + surrounding Gentile culture when the latter was benign) in Germany, Austria, and possibly Czechoslovakia and Hungary, and it's gone.

I agree this is likely the case, but I think those where likely doomed at the end of WW1 not WW2, as I credit the Austro-Hungarian and German Empires as their incubators. We are unlikely to see the Kaisers return. It is most unfortunate because the intellectual beacon that was Vienna and groups like the Martians won't ever be seen again.