Right now, yes, but in usual circumstances you could just borrow a friend's box, your IT department could fix it, or you could have a el-cheapo Mac (either an old one or like a Mini from 2010) that can run Configurator (which doesn't require a recent version of OS X, I don't think).

Still sucks, just a bit less. not really different than an iPhone, except that you can rebuild those on Windows (for now).