In the general sense (not talking about elm) It's a risk going off the beaten path to leverage some new way of doing things that makes life easier, sometimes that risk pays off, sometimes it doesn't. Sometimes it pays off bigtime early and then starts costing big time later ( I experienced this using Meteor from early on in its life ). I went with C# when it was still beta, that paid off real well. I went with embedding lua into a embedded system very early in luas life, that was a great choice. I tried with moving to F# from C# and it was just too painful for the devs to switch (though I really like F#, it's advantages weren't huge over C# that made it compelling ). Considering trying again with converting C programmers to Rust for an embedded system where we are refreshing to a more modern chipset.

So mixed results, but just because it might not work out isn't reason to not take a risk, just have to work out how appropriate that risk is.