Even if that is true, there is typically a reason things become popular. Right now only Flow / Elm / Purescript could possibly compete in that specific space. Do you specifically see people migrating en-mass to those technologies or do you think something better is coming... soon?

(Or are you literally saying people will go back to JS? - I don't know too many people excited about the prospect of losing all the contextual help and caught compiler errors - and I don't see that happening because of RDD anyway!)