Clearwire holds over 100 MHz in every major U.S. market. To put that in perspective, thats more than five times what AT&T and Verizon are using to launch their current ultra-fast LTE networks. With that kind of capacity, Sprint conceivably could continue to offer unlimited smartphone data plans well into the future, while its competitors struggle to limit their customers usage.
If Sprint were to tap into a future Clearwire TD-LTE network, it would have capacity to burn. Clearwire can feasibly launch an LTE network with 40 MHz of bandwidth, double what AT&T and Verizon offer today and Clearwire has plenty more room to grow.
What is 100 mhz of nationwide spectrum worth? Easily billions. Sprint needs to keep control of this spectrum if they want to compete with AT&T & Verizon.