I think it's right that this change does.... It's a little change, as your colleague Ms. Bennett pointed out. She said in the House that these two words, “of us”, are “small, yet meaningful”. I agree, but not for the same reason. If you really believe in ending exclusivity, then you should have no national anthem at all, because by definition the national anthem is exclusive of people who don't belong to the country or nation. The national anthem is about us in the sense that it's not about Americans, Ecuadorians, or Sinhalese.
If you really believe it's exclusive to have “in all thy sons command” in our national anthem, then it might make sense to just let every Canadian sing the song of their choice. You could have a kind of national jukebox: put your coin in and pick your tune.
Although it is a small change, this is separating us in present-day Canada. It also has the arrogance of separating future generations, who may not agree with us, from their tradition, from their literary and poetic tradition.