If I'm Kromer and Carmichael, I might consider suing the NFL for damaging their coaching reputations. Both were considered top notch NFL head coaching candidates. Now their stock is pretty much back to lucky to get a look as a coordinator somewhere.
Id rather get the realization that I'm not ready when people wont hold it against me than to take a job and find out the hard way.
Kromer had to much on his plate, it was obvious with the way the Oline play suffered. I think he'll get the benefit of the doubt.
If anybody should be upset, its Carmichael. The offense was largely intact. I think you are seeing how much of an effect Coach Payton's insight has on game planning and in game adjustments.