There are also a lot of people using Clear's WiMax for their home internet. I actually heard someone complaining about their Clearwire speeds getting worse today. This is the 3G Clearwire service. He was saying that he doesn't really have much else of a choice, but he wished that his service would stay the same as it was. Clear might keep good support to keep people using WiMax, or once they roll out LTE in all their markets, they might leave WiMax to rust away, effectively forcing all the current customers to switch to LTE. I would think that it is 20 months down the road before you see that happen though, so it might be fine.
There is also the fact that when mass amounts of LTE devices are sold to owners of the Evo, Evo 3D, E4GT, Photon, Nexus S, E4G, etc you will see craigslist/ebay saturated with WiMax handsets, and supply and demand will push the price down. It is possible that someone who can't "upgrade" to a new phone can buy a used WiMax phone that is an upgrade from their current device to wait it out until LTE hits their market or until phones are released with multiple band LTE support and maybe even LTE advanced. I picked up an Evo 3D off craigslist the day before the iPhone was released from someone who was upgrading her 3 month old phone to an iPhone.