Nor does he address the creation of dialects, an odd omission given how much time he dedicates to analyzing the ways different speakers of english dialects may

Nor does he address the creation of dialects, an odd omission given how much time he dedicates to analyzing the ways different speakers of english dialects may misunderstand himself. Italian, for example, is primarily spoken in Italy and almost nowhere else except by expat Italians. If Italian were to explode as an international language, you can be sure there would be regional dialects pop up that may misunderstand each other in systematic ways.