I think the really crucial question is whether the Asian voters will go the way of the white ethnic blocs or whether they will remain distinct from whites.
There's also more interracial marrying (especially white-Hispanic and white-Asian) now as compared to a generation ago. So what happens with the interracial kids? How many of them will actually end up identifying as white? My nephew, for example, has a comparatively dark skinned Cuban father, but he looks as white as I do. So what will his racial identity be when he grows up?
