5GHz WIFI been there for years but the gadgets used 2.4Ghz WIFI radios so the providers opted to use 2.4Ghz APs. Just recently, gadgets shifted to 5GHz to get rid of the congested 2.4GHz band but the 2.4GHz APs are already in place.

Establishments can not just throw away their 2.4GHz system in favor of the 5GHz or the dual bands. The 5GHz/dual may start with the new hotspot setups.