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I think you mean the latter. There are many businesses that are stupid, such as tobacco, but economically viable. In the long-run, I don't think veganism is such a business. People are vegan as they think that 1. It's good for their health 2. It's good for the environment.
1 is false. 2 is probably also untrue, but it's not as clear. Once the word gets out veganism will be viewed, I expect, as a comical "what-were-they-thinking" fad, perhaps in the same way we look at leeches in medicine.
