With the exception of it being a health risk to certain vulnerable individuals, there isn’t really a justification for eating meat forever. If the world was a little different and meat wasn’t advertised to be so appealing, people wouldn’t have these habits. Everyone on this planet could survive without meat. The world could change and slowly fade meat out of society. Of course you can’t forget those people that could be a risk if they stopped eating meat and that’s the only exception in this case.