I don't think Favre's fan reaction had anything to do with him how he 'identified' with people. The team had just recently been bad, 4-12 and 8-8, and then had just come off a painful playoff loss in which they very nearly made it back to the Super Bowl. So everyone's hope was to run it back at least one more time. It didn't make sense to most people watching why they wouldn't let Favre re-neg when they were THIS close to the big one. What nobody outside the org. knew was that they already thought Rodgers was really, really good. Like possibly better than Favre good.
Few people believed in Rodgers, so the team's resistance to just giving Favre what he wanted and allowing him to come back wasn't very popular.
It's also just different this time around, because most of the fans lived through a transition already, so the concept of the next guy being good isn't as much of a fairytale. People could be setting themselves up for disappoint there, but I think it's a real thing. People's memories are of the transition from Favre to Rodgers, not so much of the 1970s Packers.