They won't lose control of Mickey Mouse regardless of copyright. Copyright and trademarks are two completely different things. I believe Steamboat Willie entered the public domain last year. That does not mean the character of Mickey Mouse is free for anyone to user as they see fit.
Last I saw, they will lose the copyright on steamboat willy on January 1 of 2024.
Regardless of whatever your point is, my point is that Disney has been the driving force behind at least the last three extensions of copyright law for the sole purpose of protecting Mickey Mouse. That’s hardly going to change now that they are bigger than they ever were in the past. I probably should have spelled that out better in my previous post.