Something happened to Don after Cooper's Eulogy, maybe a heart attack, but he's been in a coma since the midseason break. He's seen Cooper twice and Rachel Menken, both dead. We've never seen Don smile so much as in these last episodes, a euphoria of sorts, totally out of character. Roger telling Don that dying during a pitch is the best way to go and the Hobart telling them they're in advertising Heaven are clues. Diane most likely reminds Don of his mother, that he also could't save, and the advice by her former husband to find Jesus is the answer that he needs. The recent bar scene with Roger kissing him, was really Roger saying his bedside goodbyes to Don. Time is getting short for Don, the same headlights that you see out the back window of his Cadillac are getting closer. The very Jesus -looking hitchhiker that wants to take him to Saint Paul may be the best clue. The airplane exhaust intersecting the skyscraper makes a cross. Don may be ready to take that leap but it won't be out the window, he'll be leaping from the last minutes of life to the comfortable sofa of eternity.
