It is part of the conversation. There was just an NPR Forum segment about it yesterday or so. There are articles about it sometimes (e.g., http://www.mercurynews.com/science/ci_25859513/nations-large...). This solution often ends up not being pursued because it's extremely expensive and energy intensive not only to desalinate but to then pump the water to where it needs to go, and you also have waste product to deal with. So in many cases it has been decided that other avenues, like conservation, are more economical.
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