Yes, wolves kill coyotes. Or breed with them, till you don't know what you're looking at a couple generations down the road.
Wolf hunters use coyote calls to attract wolves. Yes, I think when the nearby wolves hear all these coyotes on the hunt they’ll make their way over soon enough. Sometimes when the whole coyote pack is out hunting around the neighborhood, it sounds like the hills are ringing with the echoes of their calling to one another. I bet it carries for miles.