Well, they were paying him a ton of money, and they couldn't let Aaronn Rodgers sit any longer, either. I think Rodgers will be fine, as we have a great offensive line.
Rodgers has not looked very good in their first two pre season games and Brett looked awfully sharp for the Jets even though he has only had their playbook for a week.
IMHO if Favre gets the Jets to the playoffs and Rodgers stinks up the joint I get the feeling the Packers GM may be looking for a new job at the end of the season.