He won't survive in an open prison population, and he'll likely be under a suicide watch the whole time he's in custody. I'd hang him, but that's just my worthless opinion. Either way, he will never have an open life in the US. Witness protection style identity changes might not even save him.
If he gets a dime in a book deal, I'd like to shoot him myself. His parents will probably get the book/movie deal and funnel the money to him though.
After thinking of all the ways he and his parents could benefit financially from what he's done, I'm even more sure I prefer him to be deceased or otherwise completely unable to profit from his actions. Life without parole comes to mind, as does giving him a shovel and making him spend the rest of his miserable life chained to a post digging through WTC debris.
The sad thing is, had he been captured and held by the very same people he was fighting for, they'd have publically tortured and killed him by now. I have less than zero sympathy for him or anyone who supports his actions or the actions of the freaks he joined up with, and I really can't imagine anything happening to them that could be horrible enough cause me any sorrow or pity.
The lesson to be learned is if you declare war on the US you're going to die, and the manner of your death will not be of your choosing. Whether it's right or wrong, that's the way it's gonna be. I take my orders from the President, not CNN or some spineless freaks from Marin County.