Assimilation works in both directions. America is a fundamentally cold, distant, touch-phobic culture. Comes down from the Puritans and other Protestant fanatics. The Mexicans that I’ve met have been much more social, friendlier, and more spontaneous than Americans. Maybe a mixture of Mexican and American culture will be a positive influence on both sides.
New York City wouldn’t be what it is without immigrants from various Latinate countries, both in the Americas and in Europe. There were also many of the same fears in the 1890s. About Italians, Irish, Eastern Europeans, Jews, what have you. All gangsters, thieves, Communists, or out to take us over. OMG!
As far as the dropout rate, this is true for poor white areas as well. Was also true for Irish, Italian, etc immigrants in the early 1900s. Things will adjust as time goes on and generations pass.
California won’t ever be majority Mexican-born. The majority will likely be composed of second and third generation Americans, with some aspects of both cultures.
Again. Who cares? I in fact welcome it. And Asians, and any other immigrants who want to come to CA, work hard, and build a life. It will make it a more interesting place.