My own prediction is that TDD is the deciding factor. You don’t need static type checking if you have 100% unit test coverage. And, as we have repeatedly seen, unit test coverage close to 100% can, and is, being achieved. What’s more, the benefits of that achievement are enormous. Therefore, I predict, that as TDD becomes ever more accepted as a necessary professional discipline, dynamic languages will become the preferred languages.
Robert Martin (Uncle Bob) in Type Wars [http://blog.cleancoder.com/uncle-bob/2016/05/01/TypeWars.html]