I'd disagree that the Desktop is dead. Sure, it's not what it used to be but there's no way I can do most of what I do on a tablet, phone, or even laptop. These small devices are great on the go, they're great for media consumption, but I'm not animating a commercial on one any time soon. Not by a longshot.
And Apple is getting ready to refresh the MacPro's, which tells me that they don't believe it either.