Optimism will get Bill's fans nowhere. In fact, it's what causes all the whining around November on this board.
Look up the Stockdale Paradox, and embrace it, for it will make you a much happier person.
In short, if you think the Bills are going to be much better this year, you're setting yourself up for disappointment. If you know the Bills are going to get better, it's just a matter of when, then you'll be a much happier fan. The Stockdale Paradox is of great help for those who always feel tortured and/or cheated every season.