[Jach]

I don't think this is the case at all. The problem people have with monthly caps is that they're frequently done with plans that advertised "UNLIMITED X!". There are also people who don't mind paying per GB. The problem most people have is when ISPs react according to content, such as capping your torrenting but leaving youtube untouched, or capping Netflix but not Facebook, etc.

[SolarUpNote]

I thought there was a law against doing that (net neutrality).

I've heard that ISPs discriminate between "types" of content (video vs text). But I wasn't aware they were discriminating based on the company (Netflix vs YouTube).

[Goronmon]

I thought there was a law against doing that (net neutrality).

There is no law enforcing Net Neutrality.

And really, the concern isn't that a company like Comcast will meter Netflix, but not Facebook. It's that they will meter Netflix, but not "Comcast Video Streaming" if they were to offer such a service.