That should have been a 2 hour ending... they did wrap things up pretty good though, in one episode.
I would like to have seen the Schwarz’s get more payback - if it was not for them, Walt would never have needed to go bad.
He never needed to go bad. They offered to pay for his care, they offered to take care of his family after he died, they offered to bring him back into the company. He walked away from them for some ego reason (probably revolving around Gretchen “switching” to be with Eliot), I doubt they every really understood his anger, they might not have even known he was angry with them since he always came by for birthdays.