Quick Thought on the Incentives of Incentive Pay

I wrote yesterday about how some are frustrated that when unions attempt to protect their members from capricious firings that they also make it more difficult to fire those who should not be teaching. And a related thought occurred to me today.

If all staff members in a school were rewarded when the school performed well (assuming, of course, that a school's performance can be accurately measured), wouldn't that make those staff members more eager to rid themselves of any weak links -- aka "bad" teachers?

And, in such a case, might it not be more effective if teachers shared in personnel decisions -- rather than leaving such matters solely up to principals?