I’ve found this: 7 Programming Languages That Will Die In A Few Years, which is hilarious since it lists C as a dying language. I can only hope Haskell will ever become as popular as C is even today.
Also this: 5 Programming Languages That Are Probably Doomed, which claims Haskell is dying or even already dead because it (I kid you not) has flatlined on being the 19th most popular programming language in existence (although I also don’t buy that statistic; Haskell should be lower).
Also remember that the global software developer population is growing. Estimated at 18.5 million in 2014 it is now estimated to be 26.9 million in 2021. That is an increase of almost 50%. I think it is reasonable to assume that beginners are more likely to start with more approachable languages, so Haskell is naturally doomed to fall in the ratings.