Engadget - They said it wouldn't last. And they -- pundits, analysts, bloggers, GSM fanatics -- were right. WiMAX, that flavor of 4G found in the 2500MHz band, has proven to be more of a hindrance then help during Sprint's transition from underdog to reinvigorated titan. Then there are the kerfuffles it's endured standing on the sidelines -- namely, watching one-time LTE partner LightSquared squander its regulatory good graces.