Technically, yes, and in a survival situation, sure. But when you can get whatever you want at a grocery store / restaurant, it's a much bigger hurdle for people to make that change. Realistically, people are going to eat what they like.

I'd have never even bothered with the plant-based "meats" had the doctor not told me, flat out, "Unless you change your diet, you are going to die". Literally took those words before I was able to force myself to change my eating habits.

Pushing cold-turkey veganism isn't really helping the cause here. Yes, that would be ideal, but it's letting perfect be the enemy of good.