I found his comments very insightful. There were rumors flying around leading up to the bowl game that (win or lose) it would be Frank's last game. I wonder now how far off those rumors were...
I have no doubt Frank would quit if he thought he wasn't able to get things done. Watching that clip, I feel like, whatever the reason was, and whatever the dynamics of last year's team were, he felt that way last year, so maybe your sources were right, and he indeed was considering retiring at that point.
I also feel like, since he's back, that's an indication that he feels he can get it done, and that this group of players will erase those memories. I don't think it's all about winning and losing, either. I think it's about effort, and about leaving it all on the field.