Of course it's true, water scarcity has caused wars from the Late Bronze Age Collapse all the way to modern Syria. Other regions of the world too, like in the Mayan civ.

You get it though, solving energy problems solves all of the water problems. You still have environmental issues from the desalination plants, like where to put the hypersaline water without killing all the fish. But I'd love to see desal using peak capacity of renewables.