Pierce Hawthorne: Why would I sexually harass someone who turns me on?
Duncan: I'm a Professor. You can't talk to me that way!
Jeff Winger: A 6 year old girl could talk to you that way!
Duncan: Yes, because that would be adorable.
Jeff Winger: No, because you're a 5 year old girl and there's a pecking order!
Jeff Winger: I discovered at a very early age that if I talk long enough, I can make anything right or wrong. So either I'm God or truth is relative. In either case, booyah!
Duncan: Interesting, it's just that the average person has a much harder time saying 'booyah' to moral relativism.
Abed: I thought you were like Bill Murray in any of his films, but you're more like Michael Douglas in any of his films.
Jeff Winger: Yeah, well you have Aspergers.
Answer: The implication is that Jeff will still be teaching at Greendale after Annie and Abed leave. As for who became vice dean? It's never shown, since it's not really important to the series.
TedStixon