Let's say you pass that law. Comcast splits off Xfinity as a separate company to sell just internet service, with low data caps. Comcast and Xfinity enter a deal to exempt Comcast's streaming service from the caps in exchange for some millions per year. Comcast gets some billions per year in subscriptions, because Xfinity customers can binge on all the Comcast "Stream TV" they want. New high-bandwidth services, like a young Netflix competitor, can't afford to pay off the ISPs, so they never get to compete with the incumbents. The situation is no better than if Comcast wasn't split up.