Impossible without more spectrum and/or more masts between 850MHz and 2.3GHz. Cells are too big at lower frequencies. Cells are only workable as WiFi replacements or Line Of Sight at 3.5GHz and above. We don't need any new spec for either of those. A new protocol standard can't give more speed at all.
The 5G was supposed to be about integration, not new bands or more speed.
Perhaps Nokia, Huawei, Ericsson etc are more interested in selling upgrades to Network operators and phone makers want to sell new phones to consumers? Thus the original aim is irrelevant as long as everyone upgrades.