Wildtree, like you pointed out, we still have massive amounts of salt water. When fresh water starts becoming more of a commodity, desalination will seem significantly more feasible and will likely become more and more efficient until it's no longer considered "too expensive." I completely agree with you that our current shortage of fresh water is worrying, but I think there are currently bigger and easier fixed problems than our water supply (though that's not to say we shouldn't put some focus on water).
---------- Post added 2012-11-21 at 10:07 AM ----------
I completely forgot about that. I doubt many share my position at this current time, but I don't think I would have any qualms about eating "soylent green."
"Soylent Green: That's MY kind of people!"