the question that should motivate a change like this: what does new-language let your team accomplish that you can't accomplish with old-language? question is

the question that should motivate a change like this: what does new-language let your team accomplish that you can't accomplish with old-language? question isn't answered in post, the answer is probably somewhere along a 2x increase in the complexity the same team can handle. i dunno if it is worth disturbing an existing codebase and the QA cost of making sure you didn't introduce any defects. meh. where i work, we have maybe 100k lines of javascript, and its not really a problem other than lack of types when refactoring imperative code, nothing near the scope of the problem of Java's lack of higher order functions.