Well, it's about time. Rex Grossman has finally been cut from the starting QB job, and relgated to his proper role: being a backup. Will Griese lead Chicago to greatness? That reamins to be seen. He's always been a mediocre-type QB....back in Denver, he did pretty bad in their post Supr Bowl years. Meanwhile, in Tampa Bay, he's gone to the playoffs, but most say that's moreso due to the defense.
I'd say its DEFINATELY an improvement, kind of like a Trent Dilfer to just be in there to not screw things up. But his only semi-goodness could hurt them if they get in a shootout with Brett Favre or the like.
Final Ruling: NFC Championship maybe, but no Super Bowl.
They need to get someone better (Drew Bledsoe) if they really want to shine, and the injuries to the defense are really piling up.