Make your money talk.
The only way companies will respond to anything end users want or demand is by hurting their bottom line.
Fees for going over bandwidth amount X ... Best way to handle this is show that we will not be regulated in how we us our internet.
If you do not like this policy or are worried about others like it, do NOT use comcast. Cancel your service and goto another provider. This is a free market so make sure you are paying the right company to keep it as such.