If "Mangagment" is too general, you could always go with
ELIMINATE BAD GMANAGMENT, which will catch the eye of all those typo-focused folks.
Ultimately, the "Eliminate Bad Football" phrase that we're mocking is not well known. We cannot make the mistake of thinking that everyone is "with us" to the same degree that we're with us.
It needs to be so simple that granny and grandson alike can see, read, and agree with the message.
I even think the "PEYTON KNEW" one had more general appeal.
or the post thanksgiving route:
THANKFUL FOR NEW GM - FIRE PIOLI - SAVEOURCHIEFS.COM