Yes. Back to the question about what the change might be, I think that's exactly right. The tankers can avoid the ports. If they want to ship in that area, they simply won't ship out of a Canadian port, but they'd still have the right to navigate and ship the contents through that whole area. In a sense, that's not what you want, but that's what you're likely going to get from this.
On October 31st, 2017. See this statement in context.