Is the vegan world possible?

Many people agree that the animal farming is cruel and unethical exploitation of animals, but believe that their efforts will never make any noticeable difference, but consider the development of the situation:

Imagine that one of us make the impact of only one person to move to the vegan lifestyle on average every five years and that person also affect one new person every five years. Although the change was imperceptible at first, until the middle of the century a large percentage of the human population would become a vegan and a lot of suffering would be prevented. As more people stop eating animals, it will be more vegan offer for everyone, so others will much easier change their habits. whit that pace should be only a few decades to move all people to the vegan lifestyle.

So we change our way of life, but we must also affect others to stop human exploitation and killing of animals and make this world better for all its residents as soon as we became vegan. and thus better .