In a recent article from the New Republic, Ryu Spaeth makes the case that it is fine to cast Scarlett Johansson, a white female, as Motoko Kusanagi, a robot detective in future Tokyo.
Cultural appropriation, as described by the cultural and racial theorist George Lipsitz, can exist for both the majority and the minority. It does not necessarily yield negative results as we often assume. Rather, it is a concept that reminds us to be cautious when the majority appropriates the minority’s culture, because it can often happen in a way that enforces negative stereotypes against minorities — e.g., that they are violent or servile or that they do not have a voice to represent their own culture — and entrenches existing power relations.
However, I think our usage of the term has evolved to mean only such negative instances — partly, because theorists have primarily focused on such usages. If you talk to someone about cultural appropriation, they are not going to mention Japanese animation, which often appropriates American culture; they will most likely mention black face or casting a white actor to play Mulan. So this is why I define cultural appropriation as an instance in which a dominant culture appropriates a minority culture; and this is why I use cultural cross-pollination to describe instances in which a culture benefits from using elements from another culture. In other words, cultural appropriation describes power relations; cultural cross-pollination describes fruitful interactions between cultures. I think such a demarcation will clear up our conceptual space and prevent unnecessary confusions.