The effects of the water\climate crisis in California

[Kamala's side hoe]

Agriculture aside, living conditions will deteriorate. It's safe to assume a lot of middle-class voters will move North or West.
The trend to Idaho will be probably increased, as well as perhaps a resurgence for the midwest.

How many EVs will California lose by 2040?

Depends on how much denser housing they can build in the Bay Area and Metro LA, and how many desalination plants they build along the Pacific Coast.

[Kamala's side hoe]

Agriculture aside, living conditions will deteriorate. It's safe to assume a lot of middle-class voters will move North or West.
The trend to Idaho will be probably increased, as well as perhaps a resurgence for the midwest.

How many EVs will California lose by 2040?

Depends on how much denser housing they can build in the Bay Area and Metro LA, and how many desalination plants they build along the Pacific Coast.

I'd add that--even though I don't currently have the data on hand to back this up--coastal California should maintain much more comfortable summer temperatures with climate change than Boise, the Midwest, or basically anywhere else not called the Pacific Northwest and maybe Northern New England.

Boise is technically part of the Pacific Northwest, and Medford already has fairly hot summers. But Cascadia proper will remain relatively cool outside of freak heatwaves like what we saw last month.