said by JohnInSJ:They could uncap everything inside their network, leave the 250GB cap for anything arriving/leaving their network, since that's the new choke point post docsis3
Even with DOCSIS 3 your building blocks are still 38mbps downstream channels and 27mbps upstream channels. Traffic entering or leaving the network can be built out using 10/40/100gbps links.
The chokepoint is still at the edge.