A nice dream that, and it will happen one day. One day a new world power will arrive, and American will become a historical footnote. All empires fade away.
I'm not a fan of my government's policies at home or abroad at the moment, but it's just irrational how many people hate us so deeply that they are blind to the alternatives. Do you really think China would be a better world superpower? A country that has a horrible human rights abuses record against its own citizens, that feels their people are ethnically superior to all others, a communist authoritarian government ruling the world? Let's see how you like it when that day comes. My best guess is you'll be wishing for the good ol' days when the US was the world's superpower.
I just find it so funny how Canadians are so anti-US when more than 80% of your trade is with us, your military practices with ours, our nations have a very close and profitable economic and diplomatic relationship that works for both countries yet Canadians have some obsession with constantly attacking us.