And if breeders can't sell their pigs to pet stores because no ones buying from pet stores, then they'd send them to a rescue anyways..right?
No they would stop breeding them. They aren't breeding for the sake of breeding they are breeding for money. By sending them to shelters they aren't making money. Sometimes shelters even charge a fee to drop the animals off so they would be loosing money.

If you leave the animals in the pet store the same thing goes, they will stop breeding if people stop buying.

I don't think message boards should be bashing you for already owning those animals though. There are alot of people here who have got their animals from byb's and pet stores and some people who still do and they don't get bashed.