I’m not arguing whiteness will progress, I’m arguing against the idea there will be little shared ethnic background in California or Texas, and their “minority majorities”.
That ~20% figure is repeated in California and Texas, while the Hispanic and Non-Hispanic white populations are almost perfectly equal in size. These populations intermix at very high rates powered on one side at least by very strong social forces—societal and familial—that have existed for centuries, see: the demographic history of any Latin American country with substantial European immigration + the wildly different European:non European ratios in the US vs them.
From your own article, keeping in mind Hispanic immigrant populations are of European and Native descent:
We know that light-skinned Cubans were considered white at least as of 1950 because (despite the trepidations of the studio) the public accepted Lucy and Ricky, in a way they would never have accepted a black-white or Chinese-white couple. American Indians were considered non-white, but if they assimilated and married whites their children were generally accepted as part of white society. Did you know that Will Rogers was 9/32 ~~Cherokee~~ Maya?
A huge percentage of white babies of 2098 won’t have to self identify as white, they’ll just be white.