This thread is very timely. I just watched the epidode of Seinfield where he talkes about how because players come in go so much anymore, we're really just rooting for uniforms.... "We're actually rooting for the clothes!" The players that we rooted for move on to a different team, and will now be wearing a different jersey, so we'll boo them. "Boo.... Different shirt!"
Just one of those things that have changed in pro sports from when we were all kids. Seemed back then the quarterbacks spent most of their years with one team, and then sometimes closed out their career for a year or two somewhere else.