The thing is, you can have your email address(es) under your own domain, and change mail hosting providers while keeping your email address(es). It's true that too few people are doing that.
Apart from that, email is not going anywhere (not going away) anytime soon as the standard medium for B2B communication. And in B2C communication as well, an email address is the one baseline you can count on everyone having. I don't see that being replaced by anything proprietary either.
Apart from that, email is not going anywhere (not going away) anytime soon as the standard medium for B2B communication. And in B2C communication as well, an email address is the one baseline you can count on everyone having. I don't see that being replaced by anything proprietary either.