I think Don got his act together after much meditation, and returned to work with Peggy to create that Coke commercial.
Yeah, after contemplating the different possible meanings of that last scene, I think this is about right. I am not sure I'd characterize it as "getting his act together", but more like he finally came to an understanding of his true nature and fully embraced it. He knows now that he is, at his core, a master manipulator and (like the guy who spilled his guts in the group therapy session) someone who doesn't really know what love is. So in a moment of extreme "spiritual" clarity, he has an epiphany that ultimately leads to the creation of the most iconic TV commercial in history. This is his true nature and his only way of being. Everything else he's been chasing and wrestling with all these years is essentially a series of distractions and wrong turns. He learns to accept his true nature, and when he does he can find what is for him the only "true" fulfillment and love in life -- the creation of genius ad campaigns that are historic, memorable, and award-worthy.
Everybody gets a happy ending except Betty?
I don't think everyone has a happy ending, per se. It's pretty clear that Pete and family won't live out their idyllic new life indefinitely, given his very flawed character. How long do we really think it will be before he does something to mess everything up? And I think Joan's "ending" isn't really happy in the truest sense. I just think that we see all the characters going on to do whatever it is that furthers their recognition of (or acceptance of) their true selves. Peggy, for example, gave up her dream of having her name on the door when she opted not to join Joan in running their own company, but decided instead to build her career at McCann in hopes of one day becoming another Don Draper -- an industry legend and someone that people mythologize. Peggy knows deep down that is her calling and her true nature.
Seems to me that this finale, kind of like all good finales of outstanding, long running, character-driven dramas, is not so much about neatly tying up all the loose ends. Life is not like that, and these shows recognize that by leaving many things fairly ambiguous. We don't really know what the rest of Don's or Peggy's or Sally's life will be like, but we may have some ideas based on the last few glimpses we have into their thoughts, emotions, and experiences. Having said that, I definitely feel this morning as if I've lost a good friend (or friends), and I'm going to be sad about that for a while.
Hats off to a truly magnificent seven years of top notch entertainment and story telling.
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