The future (very soon) will probably imply food shortage or at least shortage of space to grow it. Countries like Saudi Arabia and China are buying land to produce feed to produce meat for a growing population.
If we are to talk about animals in economic terms, and I guess I should in this blog, according to the study Nature Climate Change, published in Nature, meat and dairy are the least profitable sources of nutrition. 97,4% of the cost to feed them is lost. No other industry would consider such a lousy ROI. It is only viable for the meat and dairy industry as they get most of it covered with subsidies weighing heavy on the torn world economy and tax payers.