Thinking about new language features in terms of, what percentage of JS developers will understand it and what percentage will be confused by it, there's an arg

Thinking about new language features in terms of, what percentage of JS developers will understand it and what percentage will be confused by it, there's an argument for just leaving things be. I would bet 3 years from now less than half of developers will be able to explain :: in an interview. Not that a much higher percentage could explain 'this' but what's done is done.