The best description that I've seen of this is that the ISPs want to turn the Internet into cable TV. That is, you pay 'x' for the "basic" package with access to a few websites, 'x + y' for the "silver" package with access to more, 'x + z' for the "platinum" package with access to the rest of the Internet (e.g. The Register), etc.
They wouldn't do anything so obvious as charging you for access to specific web sites. Rather, they would simply raise the cost of basic bandwidth to ridiculous levels and then "zero rate" sites for which they've negotiated a cut of the revenue.
I can remember when Compuserve and other proprietary communications services were still around. You got a basic walled garden, and access to anything outside (including basic e-mail to anywhere outside of their network) cost eye-watering extra. They charged third party companies money to host forums inside their system in order to access their users. I can recall when Siemens used to host their user support forum services for their industrial automation business inside Compuserve and people in the automation business paid for Compuserve accounts just to get access to the Siemens content.
Once the actual real Internet became more widely available, people dropped Compuserve, MSN (the original incarnation of it), and the others like a rotten turd. You could get direct access to anyone anywhere, without having to worry about which network they were on. You also didn't get charged stupid premiums for going outside the network.
The biggest ISPs are looking to return to those days, where monopoly control of the user base is the basis for demanding a cut of the revenue associated with every byte that goes through their wires. No thanks, I think the CRTC made the right call on this one and the lobbyists can go stuff themselves.