What happened to Scrubs when Zach Braff left may very well happen to The Office. We'll have a perfectly enjoyable book-end kind of season finale, then we'll be back for one more season. It will be a painful thing to watch and NBC will eventually pull the plug on the show.
There's also a possibility that the show will thrive on. For the past seasons (withe exception of the present one), Michael's character has been less and less the main center of the show, which I've been really enjoying. I think Greg Daniels did a tremendous job adapting The Office to US audiences and I hope the ratings will keep flowing in even without the help from Steve Carrell. Cause let's be serious, this is NBC. The second the show ratings go down, it's game over.
On a lighter note, I can't wait to see who's gonna replace Michael at the head of the branch. The smart thing to do would be to bring in another A or B-list comedian to avoid plummeting ratings.