I have to admit, I have contributed to this trend. Three halvsies at our house.
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A Japanese girl I know was taking a college course that had something to do with race/ethnicity in America. Her English wasn't so strong so I was helping her read one section of the class text and the author argued that the Japanese-American would eventually cease to exist as an ethnic group because of a combination of intermarriage (including marriage to non-Japanese Asians) and almost no new immigration from Japan. It's probably true. The same thing is happening in Brazil. For several generations the ethnic Japanese there mostly only married other Japanese. However, they are startring to intermarry more and more.
Of course there will always be Americans, Brazilians, etc, with Japanese ancestry and there will be a few immgrants here and there who will call themselves Japanese-XXXX. However, the unique Nikkei culture found in countries that had mass immigration from Japan in the past will probably disappear.
Faith is believing what you know ain't so. -- Mark Twain
I need to track down the data but I know that I have read that, in America at least, the J-As are the most integrated (highest percentage of mixed marriage) of all the A-As. That is due to a number of things including the history of the immigration, the impact of WWII, and undoubtedly many other factors.