I shed my Yahoo mail 15 years ago. It was easier back then, especially since I was moving to Gmail, which was miles ahead of Yahoo's interface at the time. I don't even remember when I stopped checking my Yahoo account, nor when it was automatically disabled because I didn't log in for too long.

About two years ago I started moving away from Gmail, and that was a lot harder. I kept checking but eventually had to just set up a vacation responder. I still check it about once every couple months, but to truly move away from an email address, you have to really stop using it.