The league would make money hand over fist if every team had throwbacks only for an entire season.
Each team picks one home throwback, and one away throwback and that's what you play in. Fans would vote on which ones, best ones win. Fans then proceed to spend ridiculous amounts of money buying jerseys, hats, etc.
For the Bills, it'd be interesting to see which era of throwback would win, or it'd be a mix of the blue home jerseys and the nice white 80s/90s away jerseys.