Of course, if your country's currency is an international joke, using the dollar does make you look better instantly.
I don't see Canada giving up their currency any time soon.
Regards, Ivan
The funny thing is that much of Mexico already uses the dollar. It may end up a common currency by default. This will be a good thing if it happens on its' own, the result of market forces rather than governmental interference. Of course at some point there will have to be official governmental action, but the more these things happen on there own, the better.