'On paper' the end of net neutrality will mean that big companies like google or facebook (which, according to the website, do not support net neutrality [why would they, right?]) will pay the ISPs for priority connection to their service, and ISPs will be able to create 2 payment plans for their customers - throttled network and high-speed, super unthrottled network for some premium money. And some people are fine with that - 'it's their service' or 'i only use email so i don't care' or other things like that.
But we are living in a capitalism world and things aren't that nice. If it is not illegal to slow down connections 'just because', I bet in some (probably short) time companies will start abusing it to protect their markets and their profits. I'd expect under the table payments, so the company F or B will be favored by a given ISP, and you can forget about startups trying to shake up the giants.