So far the exact opposite is happening, although you are correct that being the top selling car in the US won't happen, just the world as a whole. It's a pretty easy prediction, as even if it is wrong it will still barely trail Toyota for the top selling spot, barring some significant disruption and reversal.
They come #1 in Norway and their next best showing is #3 in China, but plenty of large markets where they're way down the list (e.g. #49 in Spain, #40 in germany did not make rankings in Italy, Brazil, India).
