How much do you want to bet that light users will still pay ~90% of what they pay now?
Ah, the wonders and joys of consolidation in the cable industry.
The peering costs are the problem – TW pay for every byte transfered to/from the internet. Thus, the 10% of users who use 90% of the bandwidth are a huge cost for ISPs, and this is why they’re trying to get rid of them, or charge them more.