At $20,000/per, great where you have backhaul and power. Capex budgets are artificially constrained at most telcos. Wall Street is demanding higher dividends and lower capex, even where irrational. Verizon, AT&T, Vodafone and Telefonica have all reassured the street they will keep capex down.
Small cells have been the next big thing for years, but I haven't seen many of them. Christos Karmis of Mobilitie tells me that's changing dramatically in 2016 and with a salesman's enthusiasm predicts 1,000,000 by 2020. Sprint is planning 70,000 small cells, while Verizon and T-Mobile have talked big plans.
Some will be indoors, more likely to be called Distributed Antenna Systems (DAS,) especially in large buildings impractical to fully cover from outside. Some of those outdoors will also be called DAS, some counted as cell sites. From here on, cell site figures will be impossible to compare. Capex budgets will become even fuzzier than they are today. Many of the small cells, indoor and out, are being installed by third parties like Mobilitie.