I personally have nothing but respect for T-Mobile. It is hard to change fundamental things such as pricing when you are such a large corporation. Doubly hard if your competitors have successfully proven contract pricing works.
I hope T-Mobile continues to innovate. The telecom industry is overall a dinosaur. What keeps them alive is their infrastructure and rights of way. If we ever get a wireless alternative that is as fast as fiber (and easily deployable) we'd see the end of traditional telecoms as we know it.