Your lips to God's ears, but I think 5G is complex enough at many levels that it'll take longer for the masses to convince themselves that they "have to" move away from 4G.
4G is great right now for most people, overall. If it works, don't fix it. I'd say it has longer legs now than 3G did back in 2010-2011, and I'd say 5G is more complex to roll out today than 4G was back in 2011.
Plus, I'm on T-Mobile. They have a history of moving forward rather aggressively, which means switching out and adding bands quickly. The 5G phone today probably has a relatively short shelf life in that environment.
That's why I'm looking at midrange phones. 5G to me is going with a Qualcomm 765G phone today, not a $1500 flagship. But, one has other considerations when buying a phone. Me, I like Samsung's wireless powershare for my watch and earbuds. If having that feature forces me to a more expensive 5G phone, I'll think carefully about it. (Or I could just keep my S10+...)
Anyway, this is a good read on the 5G stuff:
https://www.androidcentral.com/how-much-do-you-really-care-about-5g?
Pay TV cord cutting discussions also talk about "cord-nevers," the young people who grew up on Youtube and whatnot and who never get cable TV at all when they move out on their own. Similarly I think you'll see a bunch of 5G-nevers as well, given how well 4G works, how expensive 5G phones are for their limited additional capabilities today, and the hurdles needed to make 5G significantly more relevant to Joe Sixpack.