http://www.espn.com/nfl/playoffs/machine
Well now that we are into the last quarter of the season it's back. With the extra week this year I think they said it's the first time that no one had clinched a playoff spot by week 14.
To get 4 AFC North teams in, I think a Cleveland and Pittsburgh tie pretty much needs to happen so as to give both of them an edge over any 9-8 team. Looking at the simulator there has to a pretty insane amount of Black Swan type outcomes for this to happen, but it could.
I managed to get a scenario where 6 AFC Teams finish with a 9-8 record and finish behind a Browns team that's 9-7-1 and a Steelers team that's 9-6-2. Ony the Jets, Jags, and Texans would finish with a losing record in that one. I sort of hope it plays out that way as it would be wild.