Which is why I'm excited for a more ethnically diverse Japan. As a resident of the Bay Area I only see diversity as an advantage of introducing new thoughts and creativity. It comes with challenges of lower trust among neighbors. Though, I learned that through respectful interactions and an open mind the perspectives of someone completely different shaped me into a more mature human being, and it made me realize that my fears were only conjectures derived from no real evidence.
In this transition to a more diverse Japan, will the world lose some of its traditional beauty? Undoubtedly. But, I would like to argue that Japan is a developed country where it already lost a significant amount of its traditional culture during its modernization, and new distinctly Japanese culture emerged from the ashes of the old.
I can't wait for the new culture that will emerge from a ethnically diverse Japan. And hopefully they'll let me be Japanese again, as I was born there and still dearly love it.