Comcast already controls over 50% of the high-speed Internet market in the U.S., and it faces no competition in a large number of markets. It was a blessing that the government shot down its merger with Time Warner, but we need to take things a step further given its utility status.
Utilities are best regulated rather than broken up. Avoiding unnecessary duplication of infrastructure is generally a good idea. That said, treating communications as private utilities does run the risk of slow rollouts of new technologies.