Interesting series of predictions. Oddly, though, what you're predicting reminds me a bit of the diet section in Body for Life, which I've been skimming. He seems to advocate (already) a lot of what you're saying: Potatoes and brown rice are good , portion control (the old "size of your fist" idea), that sort of thing. However, he has no problem with animal protein, and I don't remember reading anything about protein from plant sources, either.

Hopefully, if I've unintentionally distorted his ideas someone will be along shortly to correct my errors.