I don't know about the part of people introducing something like that into wild animals, even when they are undesireble or a nuisance. People playing around trying to intervene, usually ends up making things worse.
Eventually, it does seem that thing balance out. I'm not saying people don't play a part in the process. I just think that we need to be careful. Many species of animals and plants that have become bigger problems than the original problems they were introduce to solve.