Net Neutrality doesn't say ISPs can't charge customers for data usage. Which is what my answer would be: charge customers for data usage.
Some ISPs do this if you go beyond a certain amount per month. But if a tiny portion of users are hogging a massive amount of bandwidth (as is oftentimes claimed), it seems like an ISP could make a killing by offering cheaper bandwidth but charging for data usage, which would drive these high bandwidth users to other ISPs, which means you can provide your remaining users on average better bandwidth for a lower price.
I'm guessing that Netflix and video generally have somewhat democratized high data usage. At least they've probably shifted it from torrenting to hours and hours a day of video and music streaming. Haven't seen a breakdown recently though.
Some ISPs do this if you go beyond a certain amount per month. But if a tiny portion of users are hogging a massive amount of bandwidth (as is oftentimes claimed), it seems like an ISP could make a killing by offering cheaper bandwidth but charging for data usage, which would drive these high bandwidth users to other ISPs, which means you can provide your remaining users on average better bandwidth for a lower price.