Are the following three statements more or less correct:
-To send someone an encrypted email basically entails having access to their public key (either smime or pgp). Thus for all practical purposes you cannot send anyone an encrypted email these days, unless the recipient has previously gone to the trouble of acquiring for themselves a public/private key pair and then making the public key available to others including you.
-Only a very small percentage of people who send and receive email have acquired their own security certificates (i.e. public/private key pairs), and thus the vast majority of people are sending and receiving plain-text emails almost exclusively [except possibly in a corporate setting. Btw, what % of corporate business email users have encrypted mail]. Plain-text emails are generally readable to a vast range of 3rd parties while in transit, including automated processes which use scanned email content to generate marketing profiles and ad content subsequently directed in one form or the other to the people who wrote the emails.
-Email is increasingly less relevant with other modes of communication available, (texting, skype, etc which are also not generally encrypted) but email is not going away any time soon.