There are only two signals you can send to your cable company: giving them money or not giving them money. When you keep giving them money, you are telling them that you approve of their behavior and wish them to continue. Continuing to pay them for a service you don't think is worth the money is utter stupidity.
So, your proposed solution is that I either give up Internet access altogether, or switch to using my ILEC (which means giving up my VoIP landline) for access?
Purely symbolic personal actions are easy - as long as you don't care about self-harm.
The problem is that I have no other choices of ISP. This is not just my personal problem. It is a problem of US national policy. Depriving TW of my monthly fee won't accomplish ANYTHING useful. Changing national policy - making cable ISPs common carriers, being the most obviously useful immediate change - WILL. So I argue in favor of that change, because pursuing that change by publicly advocating it as a response to Comcast's bid to become an effective monopoly player in the US cable industry IS useful.
Denying Comcast's attempt to acquire TW would also be useful - but only in the short run. Making acceptance of common carrier status for their combined ISP business a condition for approval of their merger would be more useful, long-term.