Honestly, even just a tweet from the BDFL twice a year saying 'I still care about this' would be something.
It's impossible to evangelise something when the creator has seemingly taken his ball and gone home.
The idea that enterprise should use Elm is laughable.
Live projects appear to be alive. There is activity, developers to talk to, support to purchase, release notes to read, even if those release notes are just maintenance notes for mature software. If your evidence of life is pointing to a two year old forum comment, I hate to break it to you, it's dead.