Well, as in any preaching of 'good news', those who do listen will benefit. I plan to do any preventative action, i.e. diet, etc. which will gain me the most benefit from this information. There have been instances of grass roots knowledge which went up the 'food chain', but we tend to forget about that. Before this, it was only available to 'health nuts' in specialized stores.
Antibiotics destroy all bacteria in the body, even healthy ones.
Yogurt replenishes the healthful bacteria in the body. You can be sure that it was demand which caused yogurt to be readily available in regular supermarkets. Such is the way of life, if enough people are concerned for their health, eventually the information becomes available. It is passed by word of mouth, now modem to modem, instantaneously over this great nation and world. It is the educational establishment which promotes the myth of the priesthood of education, but you will find most people will try something if 'it works'.