I expect the continuation of functional programming concepts, like abstract data types, Maybe/Optional, and immutability to be adopted by non-functional languages. Java will probably live on, but in the likes of COBOL; Usage will probably drop and the few programmers who still bother with it will get paid handsomely. I think Elm does a better job than Angular/React, but Angular/React will probably persist. Perhaps Python will be the next Perl. What I would like to see is more Haskell and less of everything else.