It's a solution but it's not necessarily easy. There seems to be the mistaken belief that WiMAX was developed for rural areas. It was originally developed (just like LTE) for metro areas. It has been found that it (Revision E) works reasonably well in some rural areas but those towers, equipment and radio spectrum are not inexpensive. Once those towers are both in place and paid for it becomes a relatively inexpensive "last mile" solution.
WiMAX is not as inexpensive as, say, Motorola Canopy on the tower end ($12k for a second order diversity system plus antennas versus several thousand for Canopy versus less for other systems). However the subscriber units aren't all that bad; $350 or so for something that, with an antenna, can do well in rural areas, if you know where to look.
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