Well, Canada and the rest of the world has already converted...I don't see how it's that much of a problem. Most products sold in Canada (like food, I mean) tend to have weird American measurements so it translates over to Metric strangely, whereas it's perfectly normal with the American measurements...but seeing as how the Metric system is better than the American system in every conceivable way I see little reason not to switch over. I say screw the people who say they'll be confused, they just have to deal with it - it's called progress.
But it's not that the Metric system is "simple" as much as that the American system is overly complicated. The Metric system is logical and base 10, just like our number system and is pretty much the way people thing (due to the fact we have 10 fingers). On the other hand, the American system...has no basis in reality, really, and makes no sense unless you're accustomed to it. I mean, the Metric system actually relates to the world (one cubic centimeter of water weighs one gram, which equals one milliliter, for example).
I just find it endlessly confusing and infuriating that Americans insist that they keep with the old and archaic systems...it'd be as bad as someone insisting they want to keep their version of Windows DOS around because they're used to it and they find Windows 7 confusing and therefore not as good.