I thought about this because I was doing it with my own adoptables- Will anything ever happen to kennel dogs that were owned by people who no longer exist? I mean not even just didn't come over from PI, but dont even exist on PI anymore?
Well, we don't have anything in the rules about having to be on PI. If by "will anything ever happen with them" you mean "will they be redistributed," I think I can pretty safely say no, they won't.
Kennel dogs will never be rehomed. It's one of the Kennel beliefs! ^_^