But each English speaking country could form its own academy and work together, which is how Spanish speaking countries do it.
https://en.m.wikipedia.org/wiki/Association_of_Academies_of_...
To the latter point, for example, a lot of companies use Oxford comma in general but don't for press releases and related because AP doesn't follow Oxford.
In general, though, it all works out. I see very little appetite for another group of authorities than the ones who already exist.
You might be interested in "Because Internet: Understanding the New Rules of Language" by Gretchen McCulloch. McCulloch is a linguist, but it's a light/layperson's book. I really enjoyed it.