Bill,
I think some people still root for Clean up the city boy for a few reasons. Although as you say he is a proven perpetual loser with a new championship ring, many fans like their team's QB to be somewhat masculine and loyal.
By masculine I do not mean rough and tumble like a 5'10" CB, but really just to avoid being feminine. For instance, there is no need to wear gloves and be afraid to throw a football. By comparison to these traits, JP looks masculine. He may make stupid plays but masculinity and stupidity are far from mutually exclusive.
JP also embraced Buffalo which for some people is important. It does not translate to success on the football field but it can be nice for some to know that their QB and "team Leader" does not bolt for California because he is literally intimidated by snow.
People get confused not because they have bailed on the Bills but because they feel the Bills have bailed on them. The alternative to JP has now proven himself to be a perpetual loser as well and did so with all the girlishness you'd expect from a Los Gatos.
I think the bottom line here is that two wrongs don't make a right. As soon as the Bills get a real QB, JP and TE will both be forgotten. Personally I think either Tim Tebow or Jay Clocker would be good choices but I am far from an NFL scout. Tebow may be available in the 2nd round allowing us to shore up our pass defense in the first.