We will never get rid of e-mail. It will be necessary for the foreseeable future and have a much longer lifespan than say, fax. But anyone who can see the writing on the wall with respect to privacy will/has started moving away from any public public or even private public messaging system for as much of their important communication as possible.
Using systems like Tox, Signal on your phone, or something that you have control of needs to be a priority in your life -- and as part of that, you will have to become an advocate (evangelist really) for others to get on board.
One big weakness is people using social networks as communication systems purely due to their convenience and ubiquitousness. There are/have been attempts to make privacy oriented social networks (diaspora, etc.), but the nature of shouting from a mountain top does not lend itself well to privacy.