Someone had retweeted this blog post from Miguel on Twitter. There's some interesting points made.
I still use Linux on several machines but one thing I can't stand is Ubuntu's Unity. I am currently holding out using just the command line and the Gnome desktop.
As said though, the arrogance put into Linux is just such a pain in the arse. I don't think it's going anywhere as a server OS but unless there is some sort of Steam breakthrough, the desktop usage will continue to contract.
It's worth reading the comments on this post as well as there's some good points made both for and against Miguels opinion.