IMO it's safe to say that Elm is dead and won't come back with this attitude of the core team (which is not the only problem of the language). We never switched to Elm 0.19 from 0.18 but moved on to rewrite in Svelte 5 with TypeScript and never looked back.
There's a vast gulf between being prudent with feature additions, and doing effectively nothing at all. Of course a language that preaches the former but materializes the latter would die sooner or later, as people get fed up with the lack of updates. And in the meantime, TypeScript just gets better and better.
Evan especially wrote and spoke a lot about his philosophy re: the project which I think can be fairly summarized as “everyone just sit down and shut up.” But that’s not a lot to go on when trying to evaluate if a project has staying power, mature governance, and so on.