Is total global vegetarianism a realistic idea?

I listened to a female guest in NPR explain well and defend her position about not raising and preparing animals for human consumption. That people are consuming live sentient creatures and that we are better off, health wise, eating plant products.

She indicated that it is not only about the manner of ending an animal’s life, whether it’s humane or not but also about the animal’s life per se, growing up in line for future slaughter.

She mentioned about mother cows, helpless and suffering as their offspring gets taken away so they could produce more milk which is artificially induced. Listening to all the other sad animal stories told, I started thinking about buying tofu tonight.

But here’s the question, is global vegetarianism a realistic scenario-? Could human beings produce plant based food enough to sustain everybody without looking at a cow and thinking juicy medium rare steak-?