There are probably worse problems to have than being popular. You could constantly be battling patents in court or your OS provider could have bought another hardware company. In comparison having to delay the launch of their new flagship device, the Samsung Galaxy S III, in Canada due to too much demand seems like a walk in the park.
Samsung is also treating it as a walk in the park, merely saying that they need to delay from the original launch date of the 20th. With a reported 9 million pre-orders world wide, we get it. Hopefully it proves worth the wait.