Possibly, but this could also be the day that animals we now eat are considered useless to us and so not worth caring about. They could be driven to extinction

Possibly, but this could also be the day that animals we now eat are considered useless to us and so not worth caring about. They could be driven to extinction if we decide to use the land for other purposes, such as building huge labs to produce the meat. So we'll need to think about keeping areas available for animals. And enough people will need to care.