Brief thought exercise: does Mad Men need to end with Don, Roger or Pete dying?

[youtube http://www.youtube.com/watch?v=85_pl_2Ugjs&w=600&h=315]

You all know the theory by now, hopefully: because Mad Men's title sequence contains a man plummeting towards Madison Avenue, there's been speculation for about seven years now that one of the main characters will die as the series ends. Well, the series isn't ending for about a year, but t…