And how many use or will use the tech, and how many of those will use it competently, and how many of those are competent to validate and know that their checking technology has not been compromised (e.g., hacking or distributing bad authenticity checkers and/or certs like hacking or distributing bad crypto-wallets)?
End-to-end encryption was a giant pain in the butt that required dinking around with PGP or whatever, but now it is a pretty mainstream feature for chat apps (once they figured out how to monetize despite it). Tech takes a while to trickle down to mainstream applications, but it'll get there if the problem becomes well known enough.
I agree that e2e encryption is becoming more widespread and "user friendly".
However, the friendliness seems inversely proportional with the ability of the users to detect that their tool is failing/corrupted/hacked/etc. So while we might have more widespread tools, we also have a more widespread ability to give a false sense of security.