Well then all of the customers of said transit providers would leave and switch to one that can reach the millions of Comcast customers. As Level 3 said if the

Well then all of the customers of said transit providers would leave and switch to one that can reach the millions of Comcast customers. As Level 3 said if there is a problem with peering amongst transit providers someone can switch to another provider. If there is a problem reaching Comcast customers there is nothing the customer can do or the transit provider as there is only one route to that customer. That is the leverage Comcast has now. If the end users had multiple options they would switch providers if connections were unbearably slow to YouTube or Netflix. But we know they do not so regulation is needed.