At the rate its dropping it won't take long to get there. And whatever the fair exchange rate is the CND$ will most likely shoot below that before equalizing.
I remember all the talking heads on BNN a few years back bullish about the CND$ when it was already at par. It was already dropping fast recently before much fed talk and now with the latest announcements that Canada will keep rates low while the US has plans to increase, I don't doubt we'll see a $0.75 CND$ in the next couple of years.