I think people have already taken the good parts of Elm and implemented those ideas in other frameworks. Redux was inspired by the Elm, for example. I personally like using React, Redux, and Typescript. It's nowhere near the purity of Elm, but it's good enough.
It seems like the size of the pool of the "Elm disaffected" is large enough by now that a fork of the entire project might be worthwhile.
I imagine there are a lot of software engineers (like me) who at one time used Elm, but lost interest under the leadership of the core team.