You can't pin that rap on me.
If there is none available at the lower price, people will pay a higher price if they really want something.
Why are you so certain it will be so expensive, anyway?
Because as an engineer, I have some idea of what physical reality is required. And I read articles talking about what is required to make such a thing happen.
Why do you assume it is cheap and no one does it, except in places with an abundance of energy and cash, like Saudi Arabia?
I am involved in the Desalination project in Carlsbad, CA. It is very energy intensive and expensive, but will be critical moving forward as a supplemental source.