Yeah no switching a group of developers over to some new language is not more efficient. It is a lot of work. And on top of that you will need to add time to either wrap your existing code base or rewrite it with developers who are new to the language they are using. You will have folks who like that and can do it, but you will also have a lot who would have a much harder time with that. Most corporations would legitimately ask what is switching the language gaining us and is it worth it. Now the conclusion might be that it is worth it, but it is equally possible that they decide against it. Never underestimate inertia.