Not on a state level. Exurbia and latent white ethnic enclaves might be possibilities on a local level.
1. Exurban areas are often more rapidly racially diversified than the post war suburbs were. Examples can be seen in places like Orange County, NY or, to a lesser degree, Chester County, PA which have sizeable populations of blacks/Asians/Hispanics compared to the lily-white suburbs of postwar Long Island and South Jersey. Then you have places like Palmdale and the rest of the Antelope Valley in Los Angeles County where Hispanics and blacks equal whites in terms of total population, although these exurban areas were farms or desert only 15-20 years ago.
2. "Latent" white ethnic enclaves? Where? It is nearly impossible for white folks or any folks for that matter to maintain ethnicity past the 3rd generation. According to the census bureau, nearly 90% (!) of all Polish Americans marry non-Polish Americans (as a Polish/Italian hybrid myself, I can attest to this). An Italian American from Pennsylvania who moves to Phoenix or Sarasota will simply become part of the assimilated white non-ethnic culture that dominates said areas.