Clearwire still has their own customers that use WiMax service. Some of those people are still on iSpots (like me) and pay next to nothing for our service each month. Killing off WiMax would make those people mad, and then they would lose their customers, thereby making their financial situation worse. Their earnings call was depressing enough with a Net Operating Loss of over $400 million still. Keeping WiMax for as long as possible can only help them. When it comes time to shut it down, it will cost them money to remove the old WiMax equipment. They don't have the extra funds to waste on removing it as they turn on LTE on a city-by-city basis.