Well, if the US implements a border tax against our exports as some Republicans propose, you can guarantee that our economy will be in the toilet, for years.  Poloz' forecast will be totally worthless if this happens. 

Hopefully, saner heads prevail in the US congress. But if not, we can kick ourselves for a long time for having not already diversified our trading partners more than we have (and those pipelines to the east and west coast will be a necessity, not a luxury).