I could see this happening in Mexico...and pumping the water north...maybe even Phoenix might want to get into this deal and divide the costs by 50 percent. The amusing thing...is that this type of treatment works 100 percent of the time but there is this slightly different taste to it...and I’m guessing everyone will switch over bottled water for daily consumption (from the beautiful glaciers of Arkansas). You can also figure that the cost of water will go up by double...which means the extra cost and the water you bought...is literally being flushed down the toilet or goes down the bathtub drain.
The Sea of Cotez already has at least two plants now.
Combined with a brine extraction/solar power the water is almost a side product. The pumping and pipelines would cost as much as the plants - but they could be solar powered.
Guess all those Old Farts that moved to Las Vegas and SoAz will have to move elsewhere.
And have Mexico in a position to threaten to stop water supplies to part of the U.S.? Not a good plan.