“We already don’t eat whale. We think whales might be smart. The next question is cows.” Roth says. Most Americans would recoil from eating whale, and feel justified in criticizing the Japanese over whale and dolphin hunting. Most Americans also eat beef. This is possible not because humans evolved to eat only land mammals, or because whales are closer to us in appearance than cows. Both whales and cows are intelligent, social animals with distinct personalities and a range of emotions. The single biggest difference lies not in whales and cows themselves, but the way our society accepts eating one and rejects the other without rational inquiry. If the tide of social paradigm shifts, eating animals in general might be considered morally outrageous by all.
I think his timeline is aggressive, but otherwise he is spot on.