Perhaps an unrelated questions (open to everyone), what specifically are Canadian users concerned about regarding US servers? I'm aware of copyright issues/differences. Is there something else that would be a concern?
Can't answer from the Canadian point of view, but from a European point of view, data that could be personal, can't be stored outside the EU, as the data protection act mayn't be as stringent as EU requirements. When you sign up to sites that are based outside the EU, the more responsible ones will have a disclaimer warning EU citizens that data will be stored outside the EU, and therefore not subject to EU regs.
My gut feeling is that rather than countries (any country now) looking at any other country & saying you can't store data there, they'll be thinking "we know our laws, we can't guarantee what other's laws are, so we'll assume they aren't as good as ours". It's much easier than trying to evaluate other people's laws.
Those of you who have used Eduspaces in the past will know that the server was going to be moved out of the EU (in that particular case, to Canada) - and in the end the difficulty of copyright, data protection etc., from something that originated in the EU was deemed to complex, so they stayed in Europe.