The single best article I have seen looking at the reasons for Nordstrom's fail in Canada, and more generalized take on American retail failures in Canada come from Retail-Insider:
Following the announcement of Nordstrom's exit from Canada, Retail Insider interviewed a panel of experts about why various retailers from the US have struggled here.
retail-insider.com
In the article, multiple retail consultants/experts are interviewed and offer their insights.
You will see many of the same arguments I have already made above and a few extra for good measure.
100% read-worthy!
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I think the biggest takeaways were
1) No Canadian head office equals trouble
2) Insufficient due diligence before entering the market.
3) Bringing 'The Rack' stores here was a mistake
4) They opened too many mainline stores, with the general take being similar to my own, that Ottawa, Calgary and at one least one Toronto store were excessive (ie. less would have been more)
Also noted, however, were changes in currency value; and the fact that department stores in the U.S. continue to struggle as a market segment, even moreso at the high end; its not as if the U.S.- based stores, taken in the aggregate are doing stellar trade. The feeling is that w/no Canadian high-level management its just an 'easy' retrench to exit Canada which will attract less negative publicity in the home market than say exiting an entire region of the U.S. that under performs.