Sure, and then what? If we keep the systems around that created this situation in the first place, we'll end up back where we started, just with new rich people.
Just to pick out the example of veganism: If all rich people are dead, but the masses still want cheap meat every single day, they WILL definitely reinvent factory farming, with all it's horrible environmental and ethical consequences.
How so? The system of patriarchy is beyond any one individual to solve. Yet I'm damn certain you believe every man should still do their best not to contribute. Why should the system of animal exploitation (and environmental destruction, while we're at it) be any different?
Is it because one of these requires actual work on your side? You are the one measuring the same thing by two different standards.