I agree in principle, but achieving that kind of harmony between languages is analogous to the world‘s governments agreeing to “save succeeding generations from the scourge of war”. That sounds like an exaggeration, but even if language maintainers are all enlightened enough to compromise, the communities are not necessarily going to comply. The minute a language changes how it deals with dates and times, it’s more than likely someone will, very loudly, announce their intent to fork it in order to preserve the old way of doing things.