I suppose there is some statement in the license of the Waza saying that anything you will add to the map become property of Waze. So from this point of view it's maybe not very nice but fair enough as you allowed them to do that.
About the charging - I doubt that Facebook will dare to charge for using it. What I am expecting is the massive integration, possibly showing your FB friends on the map, automatic posting of the status or some 5hit like that

Anyway, it would be hard to refuse to sell Waze for such amount of money so the question is not IF but WHEN this will happen. Only thing we can do is to pray that damagedspline's port will work long (and good) enough to server us before we will all move to Android or some new Linux-based mobile device.