I don't know if Jeff Fisher is on the Hot Seat really. The Titans are rebuilding, if they wanted to let him go they would have a year or two ago.
Brian Billick is definitely on the Hot Seat. I see him getting fired at the end of the year, the Ravens are going to be terrible again.
I could see Marty Schottenheimer resigning as well, with Brees gone I don't expect the Chargers to be as good this year.
I don't see Parcells getting fired. Only way he leaves is if he retires, which is a possibility.