Those 100 people would still be eating 90% as many animals as they were before. People don't need to eat animals to live, so expecting praise for eating 10% less is pretty funny.
It'd be like a criminal deciding to decrease the amount of crimes he commits by 10% and expecting people to encourage and praise him.
I believe that's called the appeal to nature fallacy. Something happening in nature doesn't mean it's morally right. Lions often commit infanticide, but that obviously doesn't make it okay for humans to do.
That would be much better than breeding billions of animals and putting them under the conditions we do, just because people like how they taste.