The reported vulnerability in clients that use GPG is no problem if you are using the latest version of Enigmail.

Regardless of whether you use encryption, you should not allow HTML in your messages to be rendered by most mail clients. There are many schemes for snooping and fraud that work via invisible links in email. Perhaps that is the main problem with email today.

As for the silly idea that email is obsolete, that could only be true if it had a superior replacement. There is nothing else that does the same job.