This is exactly what Clearwire needs to do. Wait for LTE to come out from at&t and Verizon, who (at&t/vzw) don't have any significant portion of the wireless market, and then upgrade. Rather they should, and this is a better idea, invest now and sway the bandwidth hungry and users who want a better mobile experience. Once at&t and VZW roll out LTE, WiMax will be nothing more than a niche market.
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