I think that "O Canada" is one of the most beautiful national anthems in the world, and I can't imagine anyone getting upset over any of it's lyrics. Some people seriously need to get a life.
Interestingly, the small change makes it more similar to an earlier version. Reminds me of a change people had been trying to make to the USA Pledge of Allegiance by removing the words "under God" - but it turned out that these two words were actually additions and not in the original.