I'm certainly being optimistic about it. I think the Bills, Pats* and Dolphins will all be good, possibly good enough for all three to make it to the playoffs.
The only thing that I think could stop the Dolphins from making it is Tannehill's inability to hit the deep ball. Dinking and dunking by itself can win you games against bad teams, but against good teams you have to at least be able to threaten with the deep ball.
The Jets will have a good D, but will be plagued by Fitzy. He'll give them hope, but end up snatching defeat from the jaws of victory more often than not.