I don't think Jon's situation is permanent. It's not as definitive as what happened to Eddard, and more along the lines of what happened Arya back in Storm of Swords (attack, blackout). I know that GRRM does whatever the hell he wants, but there are too many questions surrounding Jon's true significance in all this and I don't think removing him from the equation would serve well to address all those things.
If you're looking for something cool to read, try The Way of Kings by Brandon Sanderson.
I'm going to rename this thread to remove the "on HBO," since there is book talk going on in here.