Yea, this really has no effect on Sprint's Network Vision and LTE upgrades. It will mean they lose a contract (aka $)... but it really has nothing to do with what Sprint is doing with LTE right now, at least for the foreseeable future. So, I wouldnt get too concerned about LightSquared. Don't worry... seems like alot of other people were/are confused about this too.
On another note, Sprint may get added capacity via Clear LTE... Clear is said to launch their LTE in summer 13.
Clearwire: TD-LTE network to go live in June 2013 - FierceWireless
So, Clear LTE launching, on top of the loss off LightSqared, could mean more wholesale customers (
aka $$) for Clear to keep the ball rolling. Clear already started testing LTE in Phoenix..
So, Sprint LTE on 1900 mhz starting this summer (2012).. then more Sprint LTE on 800 mhz "shortly" after... then the following summer Clear/Sprint LTE on 2500 mhz. Might work out pretty good! Thats alot of spectrum available to Sprint.