As the demand for meat and animal products would go down, the demand for other foods, clothes, toiletries, etc. would skyrocket. Right now I have to go WAY out of my way to find attractive vegan shoes, that fit and that are comfortable. Imagine if the world went vegan, how many jobs would be created in that arena alone! Not to mention the processed food industry, fruit and vegetable farms, etc. I think it would all balance out - and of course, the change would be gradual so there would be time for these changes to be implemented. I like to think that it's already happening - I can get soymilk in every grocery store I go to, even in the smallest rural town, whereas 10 years ago I could only get it in one particular store.