Board Thread:Spoilers!/@comment-3010035-20150712233538/@comment-24674051-20150713195437

I doubt that anyone would execute Isaac. Even in the times represented by the Enchanted Forest, what he did would not have been considered a capitol offense. He's been rendered powerless, and will have to live with the consequences of this actions. I think that's punishment enough. He'll probably go find some hole in Storybrooke and hide out the remainder of his days.

And before anyone suggests it, I don't think he would go back to the LWM. Anybody he knew back in 1966 would, at the best, be well on in years and have totally forgotten about him (and would wonder at his youthful appearance), and at the worst is passed on (probably a lot in this category). There is NOTHING left for him in the LWM. He's actually better off staying in Storybrooke, where he can have the advantages of Modern Plumbing and health care.