It's a plot. He'll be so enamoured with Her Majesty's head on the notes and coins when he goes back to Canada he'll start a campaign to get it back on Canadian notes. After all, the queen still owns Canada. Except for Quebec, but who would want that bunch of weirdos anyway?
"He will be a youthful 53 when he's done and could yet return in triumph (presuming he saves the world in the meantime) to run for the Liberals — or conceivably, even the Conservatives."