I'll preface the rest of this by saying that in general I think coaches are fired far too often (especially in the NFL where they do not even control personnel)...
I look at this move just like when the Jags fired Coughlin and the Panthers fired Fox. Both franchises have been reeling since those coaches got fired, both moved onto better situations and are doing well.
There's a finite number of quality head coaches. Lovie is one of them. He's had 9 seasons as the head coach and he posted 4 double digit win seasons and 5 winning seasons. His only "bad" season was his first (5-11). During that period the NFC North has been one of the best divisions in football. Green Bay might be the best franchise in the NFC right now, Minnesotta has been good for most of that stretch.
You look at the roster and it's pretty unspectacular. Cutler is fringe average. Forte is alright, but he's pretty worn for an NFL runningback. Marshall is a stud, but the rest of the receivers stink. The OL stinks.
To me, this is a completely different scenario than Andy Reid or Rex Ryan (next season). Reid was in charge of personnel and the Eagles have been on a pretty steady decline. It was time to part ways. I think Reid may succeed elsewhere still, but both sides need a change. After the Jets stink next season Rex will get canned because his schtick wore thin after those first two seasons.
When you look at the 7 firings, 5 of them make a lot of sense. 2 of them (Wisenhunt, Lovie), don't. Of those, I think Chicago will have easily the biggest fallout because they were still a good team this season and he still had the support of the players. It's going to be very tough for a new coach to come in and win that locker room.