Applause from Trevor Linney of BT. Smalls cells - WiFi or LTE - are a crucial part of the "beyond 4G" networks. It's so expensive to run fiber for backhaul no carrier in the West has a large network of freestanding small cells. (The WiFi First networks in Europe have over 10M connected. Carrier small cells are in the tens of thousands.)
LTE is starting to move to 3 carrier, 450 megabit radios, so requires plenty of speed. Over very short distances, G.fast can deliver 500 down, 200 up to an LTE cell. It's a natural way to connect a few cells in smaller office buildings.
WiFi First poses an existential threat to telcos counting on usage levels. LTE is usually charged, WiFi usually not. The profitability of telcos in the next decade will be profoundly affected by whether they keep customers away from the less profitable WiFi.