Los Angeles doesn't have any choice. The water Southern California gets from the Colorado will max out within our lifetimes, and that's assuming current replenishment flows into Lake Powell. The Southwestern drought that ended just a few years ago sucked Lake Powell down about 50 ft., exposing parts of Glen Canyon that hadn't seen the light of day for 40 years. It's insane to think it won't happen again, perhaps even worse next time. Los Angeles will find itself into mandatory rationing and cutbacks if they don't find water somewhere else. The "somewhere else" part is easy, although putting it into practice will be a huge project. But hell, so was the Glen Canyon Damnation and the California Aqueduct. If they'd get off their asses and get started, they could have the problem licked before it becomes a crisis.
i love your plan despite some of the flaws. maybe teaching individual communities to irrigate sections of land and put it to community use would supply food and possably sprout newer technologies and communities. i'm sure if someone sposered an area enough to dig a well close by this would solve numerous problems..... you know, i should pitch this to world vision. maybe instead of sponsering individual children, they could collect enough for communities.