[magicalhippo]

That "study" says "which languages you probably should not learn as a first programming language".

Sure there might not be a whole lot of Elm jobs out there. But if there is one and you feel like learning Elm, what does it matter?

Also, since you talk about good programmers, surely a potential employer won't list it as negative that you've been able to switch technologies during your career? To me that's a strength rather than a weakness.