I thought this was pretty funny. I'm not sure how funny it is if you haven't read Neil Gaiman's reply to a fan complaining about GRRM's legendary "glacial" writing.
The "Write Like the Wind" song itself? I get why it's amusing to people waiting on the next book (I suppose I'm among them now). I'd probably get it more if I'd been reading the series since '98 like some people have. I also get why it's really kind of annoying in that it reflects that entitled attitude. It's not exactly easy to write a hugeass saga, especially with millions of people twiddling their thumbs and complaining if they see you doing anything that's not working on the novels.