"I want 5G to be the best G ever," he told Light Reading's Iain Morris at Huawei's UBBF. Morris notes, " 6G may never happen, as McRae suggests. But that is by no means a certainty. And even if there is no 6G, networks will continue to change -- possibly beyond recognition."
Whether you call it 5G, 6G, or evolution, mobile progress will continue longer than I expect to live. (I'm old.) My 6G Report is about the technologies coming that weren't included in 3GPP Release 15, the current working definition of 5G.
The marketing terms mean very little: 5G two years ago was millimeter wave to most people. Some thought Massive MIMO performance also qualified. 3.5 was LTE. Then the lobbyists took over. Politicians were saying, "We must have 5G." To keep the pols content, the European telcos pressed to include 3.5 GHz, even though it was essentially the same speed as 4G. (Similar amounts of spectrum and number of antennas.)
Takeaway: 4G/5G/6G mean nothing without context. Underneath it all, tens of thousands of engineers are advancing wireless at a ferocious pace. If you need to know what's going on, follow the technology, not the name.