Yeah, pretty much this. I can never root for a loss, even if it improves draft stock. No matter how dire things are I still get joy out of the Bills making plays and my week is just better if they win. But that joy, while still there, tends to be much more mild later in the season these last 17 years.
I find my NFL interest tends to coincide with how the Bills are playing to an extent. With that said this league has really soured me over the years in many ways.