Quotehen the world's problems would be solved. but look at how many times throughout history that has happened. being the change you want the world to see is all fine and dandy, yet it doesn't help if you're a small minority of people.
Well, I personally have a somehow different view on that problem anyway, namely the situation when the great majority dearly wants a change but is too tired and unhopeful, maybe to some degree even oppressed and scared, which is the case in Bulgaria and other Balkan countries for example. And it will not change until, from the bases of the Mafia, an easily externally manipulable upper class crystallizes in 40-50 years. Of course, that's an issue a lot more far-reaching than moral vegeterianism for example.