1) Replacing email isn't ridiculous. Using "Are you powerless?" at the beginning is ridiculous. It's a weird misappropriation of what PG was talking about.
2) No one can quit email entirely as long as it's the way banks, insurance companies, employers, and relatives are messaging them.
3) If you mean "quit email" as in "stop using email for work," there are lots of people who have written about completely replacing work emails with Slack or other chat services. That was a hot topic a few years ago. I personally never use email for work except when contacting external people.
Regardless, stop spamming when you don't get a response.
