Well, there is always a regulatory measure that would be a lot easier to implement: Lawmakers could just disallow Tier 1 carriers to provide consumer Internet access. (This forced separation of business domain already has precedent in other sectors, e.g. energy companies having to separate network upkeep from energy trading or banks having to split their investment branch from the credit branch)

And I have a feeling that as soon as that is seriously discussed, the current exploitation of market power will stop rather quickly, without any need for actual regulation.

> Lawmakers could just disallow Tier 1 carriers to provide consumer Internet access.

This one I actually agree with.