And I've long been convinced that "Asia" is the most meaningless of all geographical concepts, it's basically Eurasia minus Europe.
It makes me wonder, if the world is dominated by, say, people from Indian Subcontinent, how would the "dvipa"s be drawn? Well, the Jambudvipa would be on its own, and "Eurasia minus Jambudvipa" gets its own name?
How about an Islamic-dominated world? Would West Asia and North Africa be counted as one continent?