I guess I'm challenging the notion that there's any need to be realistic. I don't know about you, but I didn't get into following football so I could hone my football analysis skills. That has happened to a degree, but the bottom line for me is I've kept watching and stayed a Bills fan because I can get irrationally hopeful that this is the year they finally turn things around.
Plus, as Bills Fan in MD said above, if the Bills come out and lose this weekend, it's not going to crush me. I have stuff going on in real life that matters. Football is a fun diversion.