I seem to recall a lot of people felt Aaron Rodgers was the next Joey Harrington which was why he slid down the draft board. Point is, the Packers took a risk and drafted a QB when they had an established hall of famer on the roster.
I have a feeling Lynn was hired to be more of an assistant coach and veteran experience for the rookie coach. I never really viewed him as a long term option.
I think the Lions go internal. If they don't, I would look at Ken Dorsey for the job.