Sprint's WiMax efforts doomed to failure?

Marguerite Reardon of CNET writes: "It may only be a test bed for future WiMax deployments, but I think the business model Sprint is using in Baltimore looks eerily similar to what EarthLink attempted to do with its citywide Wi-Fi business. As a result, I see Sprint facing many of the same hurdles that EarthLink faced in trying to sell this service to consumers."