Sadly yes. Ultimately I think any nation that values freedom will potentially be a target. It is unfortunate that while the vast majority of Muslims believe in peace and simply want to live their lives the same as any of the rest of us, a very small minority of them have tarnished their entire religion and culture.
Which leaves those of us in the western world with quite the conundrum... do we do what's necessary to protect ourselves in spite of the cries of "racism" and "stereotyping"... all the while going against our own high-held regards for tolerance and integration, or do we continue to value our belief in freedom for all, including the few that would use that freedom against us.
Either way, it would seem, the extremists win. That's why I get so frustrated when people bad mouth the war in Afghanistan. Iraq not withstanding, Afghanistan truly is a "war on terrorism", and it's the only way we're ever going to get the upper hand. Take the fight to THEM, on THEIR turf.
Even if we're never successful at erraticating them entirely, at least we can keep them so tied up defending their little caves and rabbit holes that we've diminished their ability to wage war on innocent civilians around the world.
In terms of Canada, I wouldn't see them as being a "prime target", as it's no secret the U.S. is considered the #1 "western influence" world-wide, so we'll always be their preferred prey.
On the other hand, we're talking about complete cowards in the most despicable sense of the word, so, especially given the U.S. at least attempting to step up it's efforts in security and intelligence, I would suppose that any easy target of opportunity would do.
Sorry, should have read your question better... but even in terms of a cultural "take over", I still feel what I said applies. From my limited experiance, again, most Muslims aren't seeking to force their beliefs down anyone else's throat, they just want to be allowed to practice them in peace. Again, it would seem only the "extremists" that would have us "submit to the will of Allah or die".