Obviously, you want your skills to be in demand in some capacity.
But putting so much emphasis on whether some tech skill is a winner on a scoreboard can give people the wrong impression about other languages and technologies that appear to either be unpopular or dying. It's reassuring that Java and SQL are still in high demand after all these years, but newbies looking at these charts might make the assumption that they might as well not bother learning other things like Elixir, PHP, Rust, Ruby, etc., because they're not that popular, even though those jobs exist, will continue to exist, and pay well.
Also, it's disturbing that Scum is the 13th most demanded "skill".