After thinking it over the weekend, I think I'm going to stick with Wifi, because other companies using "wireless" gives the connotations of a cell phone company.
In this company, I am still using wifi technologies (IEEE 802.11ac technologies to be exact) in order to operate this company. Therefore, the "wifi" is staying. This may take some customer re-education but I do believe that it is an important differentiator to make.
Interesting - I've never used a WISP before, I just assumed the communications to the tower was something other than typical WiFi frequencies.
How does using WiFi like this affect network saturation in an area?
Frequencies are licensed at millions of dollars per year. The only WISP I have ever known to have done this is Clearwire, who's parent company technically owned the spectrum.
In the white space you are just competing with local HAM guys. Newer gear allows the multiplexing of multiple CPE's on a single frequency. I think even UBNT has done this for a while. So that generally solves the problem.
Bigger issue is always weather moving CPE around. If you use the best mounting gear its less frequent.
There are plenty of WISPS that offer dedicated internet and charge premium prices i.e. 100mb up/down for $2,000 per month with a financially backed SLA.