I realize that a DOCSIS cable modem has a ton of bandwidth available to it. Each 6 MHz cable channel can send around 27 Mbps to the subscriber. Upstream is mo

I realize that a DOCSIS cable modem has a ton of bandwidth available to it. Each 6 MHz cable channel can send around 27 Mbps to the subscriber. Upstream is more difficult. If there wasn't any regulation, what is stopping cable and fiber to the home ISPs from just dialing down the Internet portion of your package until the competition can't fit in it any more?