I don't think that t-mobile and sprint are opposed to commoditization. The expansion of the commoditization of mobile access gives them new ways to compete against at&t and verizon.

The era of multi-year contracts and heavy device subsidies has primarily helped those with large market share maintain it. T-mobile in particular has been pushing to change how the market works and bring an end to some of the ways that customers have been locked in to carriers. I wouldn't be to surprised to seem them support further commoditization.