Best argument I heard against that worry, is that the Elves of House Tindomiel neither stupid nor suicidal enough to do something like that.Right, those particular plans merely dedicate the Waystones to a Goddess (which could still be problematic). But the argument that was made was that "the right of first refusal is a bit of a nothingburger", and I think that it's really not. They could make just a few Waystones dedicated to their Goddess and it could still cause the political complications that we're worried about.
On unrelated note, it's funny how they name gets butchered with every new person. I, for example, always have an urge to call them Tandomiel for some reason.