It is nuts that Weiner can spend an entire season showing us Don at his basest levels, and has gotten even his hardest supporters to basically turn on him, then in 15 minutes of the finale, he flipped the script and has me back in his corner.
Don is Darth Vader. He puts off this exterior of selfishness and ruthlessness, but deep down he's never fully succumbed to the dark side. He wants to be good, he just doesn't know how and still be Don Draper.
Don got rid of Jaguar because he was disgusted by them, and rightfully so. He was even more disgusted that the other partners allowed Joan to sleep with the a-hole for the account.
He tanked Hershey for Ted because he knew Ted needed it more than him. Hell, he covered up the whole affair with Ted and Peggy.
He covered for Roger time and time again. The decision to combine the firms made Cooper a butt load of money.
Don does not strike me as the type of character who will "learn from his mistakes and come groveling back." If he comes back, it will be because they beg him. More than likely, he'll go Don Draper and make then sorely regret what they've done.
Really liked seeing him take his kids to his home. Don may finally be on the path to finding peace in his personal life.