I would be beyond shocked if they fired Pettine mid-season. If they were looking to replace him in the off-season, some names that stand out to me:
-Kris Kocurek, DL Coach, 49ers
-Eric Washington, DL Coach, Bills
-Karl Dunbar, DL Coach, Steelers
-Chris Hewitt, Pass Def. Coordinator, Ravens
-Mike MacDonald, LB Coach, Ravens
But talk of him being canned now is unfair. His unit was doing its job on Sunday until the offense just totally fell apart. They had forced two punts to open the game, and then the offense gave up 14 points, and literally ended every drive after that with a punt, barring the failed drive to end the half.
I have been impressed by Pettine in the past, but am by no means a devoted defender. I'm totally open to the idea of replacing him if that's what's right for the team. However, if fans think that someone else is going to come in and, with this personnel, coach a unit that can hold up when the offense spots the opposition two touchdowns and then doesn't score another point, they're going to be disappointed.
Honestly, if you would have told me before the game that the offense was going to punt 7 straight times from minute 19 on through the end of the game, I would have expected the defense to give up more than 24 points.
The defense allowed 5.14 yards per play, which on the season would rank 26th in the league (from the offensive perspective; that is, there are 25 teams in the NFL who average better than 5.14 yards/play).
They also allowed 2.4 points per drive (excluding the 2 yard "drive" after the second interception), which on the season would rank 18th (again, from the offensive perspective; there are 17 teams who average better than 2.4 points per drive), and is actually exactly Tampa's average this season overall.