You make some very good points. I've agreed all along about the secondary - I predicted 9-7 largely because of losing 4 veterans and as recently as two days ago people were amazed I could have ever thought that. I made that prediction before Zeke was ever suspended and that's only made it worse. Also, any coach who comes to Dallas is going to be hamstrung by the Joneses, which is why I'm not sure it matters all that much who coaches the Cowboys because it's an uphill battle.
But here's why I disagree: In six full seasons as head coach Garrett has had 2 winning campaigns. We'll see what happens in this one but it's trending toward 2 out of 7. That's not exactly a track record any coach would hang his hat on. Injuries? What team doesn't have injuries? McCarthy won a SB at Green Bay with 16 guys on IR. Look at what teams like New England, Pittsburgh, and Seattle do when they lose guys to injuries or suspension. Are they as dominant? No, but the wheels don't completely fall off either. In Dallas, everything has to be just right - like last season. As soon as a key person misses time, not only are they going to lose but they'll probably lose badly. The season effectively ends because there is no means of adapting to the situation - just plug the next guy in and hope for the best.
Blaming the QB is about as bad as blaming the refs, by the way. Both are very easy. Has Dak played well lately? Nope. Neither has anyone else, which is why we're losing in epic fashion. And if Garrett can't develop a QB - he inherited Romo - then what good does his experience as a QB do us? How many passes is JG supposed to get? How much time does "Coach of the Year" (followed by a first round playoff exit) buy him? A decade?
God only knows who Jerrah would hire to replace him, but if the guy can't produce in Dallas then it's time to try something else. That said, I think JG will still be our coach in 2018. Jerry loves him.