Well thats it for the Office. They'll probably just fire Michael or have him quit. Jim will become the manager and slowly his competence will fade...
Now that would suck. John Krasinski can't fill Steve Carell's wingtips, no way.
Ed Helms and Rainn Wilson would be a f*cking hilarious duo, with their many more scenes together if Ed Helms got Steve Carell's part.