I think a lot of the older Bills fan have been so spoiled with the incredible talent of the past, that the last 20 years have been incredibly boring. When you get to watch amazing players like Bruce, OJ, Kelly, Thurman, etc, your eyes feed off it. Even other teams talent during those times was amazing. Lawrence Taylor, Emmitt Smith, Barry Sanders, Marino, Elway, etc you just get spoiled. Honestly the NFL is lacking in high quality stars like the golden days.
But it it does appear to be changing again. People like Barkley and Mahomes give you that same feeling once again.