I think it's the wrong decision.
It's not like Ralf and Juan Pablo are poor drivers and they haven't been very competitive this year.
He should stay at BAR.
Michael won his first world championship at Bennetton and they weren't exactly a fashionable team.
There's no point him changing teams, as while Schumacher continues to race, they're competing for second, which he's been pretty good at this year, in the BAR!