Vince Gilligan was just on The Colbert Report, and they were talking about Breaking Bad, and Stephen Colbert made a joke about revealing the ending, and it hit me how they ought to end the series. (Now, people who read this blog know that I love to ruin things that work really well with stupid joke ideas, so that's what this is.) So what they should do for the final episode, and to wrap up the whole series is this: Our hero chemistry teacher wakes up: it was all a bad dream! (People just love it when a movie or TV show uses a cop-out ending like this, a la Mark of the Vampire!) Oh, but he still has cancer, so rather than contributing to the drug epidemic, he decides to commit suicide instead. Oh, but to make sure that his life insurance pays off, and also to send the message that crystal methamphetamine is a dangerous drug and a bad idea, he decides to overdose himself on crystal meth so it will look like an accidental death. But, because he's never done it before, he doesn't take enough, and he just ends up going crazy and killing and cannibalizing his wife and his chemistry class at school (!!) and getting shot by the cops, finally sending a positive message to keep kids off drugs after making it look cool for so long on their TV show.
So come on, Gilligan: do the right thing and end this series with a bang and a morality lesson! And, just for extra fun for classic horror movie fans, he could die saying he meddled in things man must leave alone, etc., like in The Invisible Man, et. al.