Billing for Data Not Nirvana
The problem with billing for data is that in its simplest form, does not allow for segmented billing by value. That's the holy grail of the MBA finance types that run public companies these days.
What Verizon and the others would like to do is to bill you one rate for "less important" data and another rate for "more important" data. Think the model that cable uses with different tiers and movie channels.