Yeah it seemed so at the time. Even without the benefit of hindsight. You don't ditch 40% of your line and expect there is not going to be repercussions. Even if one of them is out of football in 3 years, you can then replace them after you have the other spot suitably filled.
And who has time to wait for 5-6 years? Brett inherited a team that was 4-12 in 1991. In 1992, after he arrived, they were 9-7. Favre presided over 1 losing season in the next 16. Rodgers inherited a 13-3 team and in his first year dropped to 6-10. There are plenty of QB's who proved their mettle in quick order. Matt Ryan took a pretty crap team and did well. I don't remember the exact timing but Roethlisberger did some good things quickly and it wasn't long ago that the Steelers put together some pretty nasty seasons as well.
Favre may have benefited from some good front office management. But think about this. He's won with Holmgren, Rhodes, Sherman, and McCarthy as coaches. Wolfe, Sherman and Thompson as GM's. Hell Harlan and Murphy as presidents too.
Rodgers has not been thrown to the wolves. He had several seasons to learn the system before ever starting. He has been placed in the MOST beneficial postion to succeed and he hasn't. Stats mean nothing. Jon Kitna put up huges numbers for the Lions. He still didn't win.