Animal agriculture seems to me like one of those things that in 50 to 100 years people will look back on with bewilderment. "You mean you birthed whole animals, let them grow for two years, fed them all the while, just to kill them, chop up their remains, and ship that to people?" Plant based protein and maybe even more so cultured/clean meat (e.g. http://www.memphismeats.com/) seem likely to totally replace how we do things now.
Disclosure: I'm an investor in Memphis Meats