You could argue that ending net neutrality enables more precise pricing models that would reflect the underlying cost of provision, so that people who aren’t consuming substantial bandwidth with services like Netflix, Spotify, BitTorrent, et al won’t be penalized by an implicitly higher plan price (because plan prices are likely currently modeled on consumption behavior near the median/mean).

For the record, I highly doubt the ISPs would pass any savings along to customers but you did ask for the other side :)