I feel like "fusion" cuisine already exists between large countries, or on the borders between.
For example "Tex Mex" is American-Mexican fusion food. Hawaiian foods are sort of an American-Asian fusion. Philippino food is sort of a Latino-Asian fusion.
It's not quite the same - those countries/foods have their unique heritage and I don't want to reduce it overmuch, but I also feel like it's kinda silly to build up rules and structure around food.
Good food is for everybody.