Telnet is still in use for its primary purpose, which is a bit different than a locomotive which has been neglected to a tourist attraction. Your last paragraph

Telnet is still in use for its primary purpose, which is a bit different than a locomotive which has been neglected to a tourist attraction. Your last paragraph means you would like to make telnet obsolete, but it isn't yet. As evidenced in the thread, it's not partical or desirable to replace it with other technology in all the deployments of it. So, it's still hanging in there for now.