>Milk will be phased out because its carbon footprint is too heavy

It really won't. The food culture heritage of a large portion of the world won't be wiped out by an environmentalist/vegan dream. In the US there is a government finger on the scale which makes dairy quite inexpensive which might see a reduction, but carbon reduction is going to be primarily constrained to transportation and power generation.

You can have my cheese when you pry it from my cold dead fingers (unless you want some :) )