What makes you think ending net neutrality would negatively affect the ad industry? They'll keep right on making their money, only they'll have one more venue -- ISPs injecting ads into other people's (non-HTTPS) pages.

ISPs are a natural monopoly and therefore must be carefully and thoroughly regulated, just like any other utility. Their job ought to be to provide a regulated standard of service at a regulated price, no more & no less -- just like your water and electric utilities.