I think a distinction needs to be made between 5g fixed wireless and 5g mobile as the fixed wireless (FWA) is intended provide broadband to homes rather than a wide, roaming, area. FWA small cell sites can be installed on light or power poles, rooftops, etc. which make it potentially attractive in areas where installing Fiber To The Home (FTTH) is difficult. Verizon estimates FWA has a potential to serve about 1/3 of existing homes mostly in urban areas.
In any case, much remains to be seen how effective it will be. The biggest hope I have for it it that it will provide some competition for the cable companies such as Comcast, Cox, & Charter so they can't raise our rates into the stratosphere.