That's what worry me about these tonic salesmen. It's as if they have not thought it all out. No, not even "as if". They have not thought this out and are woefully unaware or uncaring about the human condition that flies in the face of the wild-eyed hopes.
To top that off, there is often also a procrastination problem about doing something personal about it today. In Baha'i, for example, they're taught that mankind will become vegetarian in the future ... providing a good excuse not to become one today. That's just one example. If you can't walk the walk (in some small way), then don't talk the talk.
People at the temple where I move dirt for a hobby look at all the dirt I've moved over a summer, and are astonished. They see it as an entire load or two of dirt, whereas I see it as 5 wheelbarrows a day. The molecular theory of social change. If you can't even take that first step, how in heck will you ever complete the journey?