Keep in mind 160 MHz of this spectrum is Clearwire 2.5 GHz.
This spectrum has very poor building penetration and is largely undesirable, for anything other than adding dense short-range high-bandwidth backup.
Don't get me wrong, it's a huge advantage to Sprint, for now. But if the carriers REALLY need spectrum, the FCC will find some. There's already talk of combing the Military-held spectrum.