What a long, sad trip it's been

I saw an interesting speculation that, if this really had been the last season, Kripke's often-mentioned "five-year plan" would have ended with Sam allowing Lucifer to possess him...and then with one final act of will, hurling himself into the prison. Presumably it would have been up to Dean to then bar the gates or perhaps, to throw himself in after Sam and somehow seal both of them and Lucifer in for all eternity. This might have been a heartbreaking way to end the series, but it sure would have been the ultimate expression of the old Winchester "saving people, hunting things" ethos. And talk about there not being a dry eye in the house. Of course now we've got Season Six to deal with, so we're going to have Sam magically able to do something that no one has ever attempted...not just overcome a possession, but possession by an archangel.