The 17th Amendment was a terrible thing. I’d love to see it go. But it would take a revolution.
Direct election of senators had been proposed as early as the 1820s, and picked up support over the years. By the time the amendment was passed, 29 states had enacted some form of direct election on their own. Unless an amendment that not only repealed the 17th, but forbade the states from allowing direct election was passed, there's little reason to think much would change. People like the idea of electing their senators, and you're going to have to work hard to convince them to give up that right.