You're assuming that the US economy is going to surge this year Bruno. Personally, I would like to have a lower value of Canadian Dollar. That way I can buy more of them...
One case that I read last year on FTA going bad at the other end of the deal with the US was with either Thailand or Vietnam.
one of those countries exported Codfish to US and there was a surge of Codfish in the US that it threatened the local industry, so US (don't know which part of the govt) passed some regulation that only certain species (excluding the one imported) can be considered Codfish.