[rvdginste]

Email is one of the few protocols that was designed out of the box to be decentralized, that in the mean time is implemented by a lot of big tech players and that has stayed compatible for communication between accounts at one of those big tech players. And that is also the reason it won't disappear soon.

And aside from that, what the article mentioned is human error. And honestly, I do not think that other online communication protocols will eliminate human errors.