These (and the ones in the GGP post) are very good points.

To play devil's advocate,

- With data plans based on minimum speed, there would still be a possibility of service being degraded below the paid-for minimum speed during times of high usage at a cell site. There would have to be an asterisk in the contract to the effect that minimum speeds would only be supplied while possible. And, ideally, some regulatory oversight to ensure sufficient cell site capacity is installed based on the cumulative speed of the plans sold, if that makes sense.

- I wonder, to what degree is the structure of cell phone data plans constrained by regulation and private agreements? IOW, are carriers allowed, under current regulation, to sell minimum-speed plans? How complicated and time-consuming would it be to unwind inter-carrier cell-site-sharing agreements?