Don Draper is not real. I don't care about the real McCann Erickson guy who thought up the iconic Coke commercial, "I'd Like To Teach The World To Sing". And I'm not interested in speculating about how Don would have fought through the corporate culture at McCann to sell his concept. The ending of the Don Draper part of the series finale was just so perfectly cynical and so in character for Don, that it deserves to stand on its own. That's how that character in this story would have pushed through his darkness and gloom to re-invent himself once more at an ashram, taking out of the EST-like group therapy "seminars" those elements he needed in order to experience the breakthrough that would propel him forward.