Vox.com had a thoughtful article about possible changes in California agriculture over time under a warmer climate and how it might impact other areas of the country. In particular the Southeast was identified as a place where some agricultural production might move.
However, there are differences between the climate of California and the Southeast which would make some aspects of this shift difficult. You can read the article at https://www.vox.com/2015/4/29/8511097/california-drought-farming.
