“...San Francisco real estate prices will crash when the water runs out.”
Only in Liberal Crazytown would a city located on the ocean have the water run out.
What kind of desalination plant could be built for the cost of building a new tunnel?
Look at it from the point of view of the ‘Faith of Environmentalism’ One is transporting water from one region that ‘Gaia’ has blessed with fresh water. The other is manipulating through Human interference, water that ‘Gaia’ in her wisdom has determined to be salt water and therefore necessary to the plants and animals who live in it.
So obviously they will have to use a tunnel or aguaduct.