On the surface, a deal to host Dish's spectrum on Sprint's Network Vision platform would make alot of sense. The chart below highlights that part of Dish's (DI) spectrum is adjacent to the AWS-2 spectrum that recently has been referred to as the PCS H spectrum. Sprint is interested in acquiring this spectrum to increase their LTE channel size from 5x5 FDD-LTE to 10x10 FDD-LTE. Unfortunately, the Dish spectrum is configured where the uplink (from the handset to the cell site) would be adjacent to Sprint's LTE downlink (cell site to handset). This will be problematic for Dish. Cell sites transmit at much higher power than handset signals are received. Expensive filters on the separate Dish antennas may not be enough to allow the Dish antennas to be installed in the same plane (level) as the Sprint antennas.
You can look at this as being similar to the Lightsquared deal, except Lightsquared was planned into the deployment through the zoning and permitting process. With the standards body processes that are in front of Dish, it would still be years before equipment is installed and a network operating on Sprint's towers. A Dish MVNO to operate on Sprint's 3G Voice and LTE network would allow Dish to get a wireless product to market quickly.