said by hamburglar_:Sprint has already stated they are looking at LTE. I don't see WiMax phones being released much past 2011. Besides, if someone bought an EVO or Epic because of the 4g, they need to realize it's not much more than a novelty in most places. I bought it because of the its other capabilities and Sprint's plan pricing.
If Sprint goes LTE it would likely be in 5+ years converting CDMA spectrum once there is an LTE voice service - and I think they should. They'll continue to do WiMAX via Clear for several more years if not for the long haul. Clear has enough spectrum to do both.