I don’t think so. Remember within a month of his “retirement”, it was reported he had changed his mind and the Packers were going to send a plane to bring him to Green Bay for the announcement. Of course he changed his mind again but if he hadn’t I think he would have been the Packers starting QB on opening day 2008. IMO: The reason Favre “retired” when he did in March was the Packers wanted a commitment from him to attend most of the off season stuff and he wasn’t ready to make that commitment. He pretty much said that in his interview with Greta Van Susteren. From his point of view he felt unfairly pressured by the Packers. I think his subsequent behavior reveals he thought he could skip all the minicamps and OTAs and show up for training camp and claim his job. However if, instead of announcing his retirement in March, he had committed to the team or after he “retired” had made that commitment in April, I think he’d have been the starting QB.
IMO again based upon their subsequent behavior, particularly McCarthy and probably Thompson were ready to move on to Rodgers as the starting QB but I think it would have been nearly impossible to do so without Favre’s “retirement” and facilitation until late June that year. From Thompson’s point of view he probably had heard or read about Favre’s “dance with retirement” even before he arrived as GM in 2005. And Thompson had another reason for moving on: Remember in the interview with Greta Favre admitted to telling Thompson how to do his job shortly after Thompson took over as GM. He told him he had to keep both Wahl and Rivera. And while Favre was pressuring Thompson, he hadn’t yet committed to playing the season. After Thompson fired Sherman, Favre pressured him into signing his friend, Mariucci as head coach. And later Favre pressured Thompson to acquire Moss. The head coach is the QB’s “boss”. The GM is the head coach’s “boss”, so in effect Favre was telling his boss’s boss how to do his job and that began shortly after Thompson got the job. Yes, Favre is a first ballot hall of famer and a legend. Even so, IMO that was over the top and I would not blame Thompson for being fed up with that behavior, in addition to having put up with the annual off-season nonsense.
IMO it was Favre who created the opportunity for McCarthy and Thompson to commit to Rodgers and had he not done so it would have been extremely difficult to damn near impossible for them to have done so.