@pfm @phoe And I said "becoming obsolete". :-P This doesn't mean they're going away, it means they're starting to look a lot more like statically-typed language. Gradual typing is part of Julia and is now infecting Python for example, and probably Javascript soon (dunno about Ruby)

So my prediction, based off of current data, is in 10-20 years purely dynamically typed languages will be considered as old-fashioned and ill-principled as a large software project without tests is considered now.