it's very complicated issue. the best would be chinese who can speak english.
If they make movie just for "American diversity", it really doesn't matter whoever they cast, chinese, korean, japanese, etc. americans will support and make it big for (fake)diversity.
and America clearly is not ready for complicated asian issue. so I don't see them doing it right.
afterall it's marvel, no matter what it won't flop.
(+casting Taiwanese is not great idea too considering their tension but If we don't care china audience. why not)