Actually, that depends on whether Comcast has effective competition. If they do, prices for end-users will improve, trending closer to the cost of servicing them.

If they don't have competition, regulation can't always simulate the same consumer benefits, for a number of reasons. The regulators are often at the mercy of the regulated company. (The FCC, for example, is all telecom/lobbyist/party-functionary lawyers.) The regulated company tends to do fine, as their model and margins get frozen into slow-moving regulatory law. Smaller/newer companies with other models and technologies can't as easily fit into the regulatory mold, which often even bans them from offering the high-value (differentiated) services that could offer a competitive toehold. Can't have some upstart skimming off the cream from the now-tamed monopolist!

Which is why in all cases new competition, not formulaic rules from DC lawyers, should be the policy priority.