Will wolves kill them? That'll be the next thing they do. Maybe a bounty on them. I know the buggers tear up everything and I sure don't envy you all that have to live with them.
I have heard of folks using a substance they get at flower shops to kill coyotes and such. It raises blood sugar levels to lethal limits. Not sure if that would work on pigs though. I believe it's the cut flower food but not 100%. I would think that would have less environmental impact if it worked. Hope they can manage something.