On one side, we have the entire might of the relevant JP console third parties and exclusivity on the popular western games. On the other side, we have a plumber and some squids. Took them long enough seeing how the Wii U has had about half a dozen notable releases this year.
It's good for PS4 to get here, and software sales seem to be sustainable enough for good releases for the most part, but the Wii U will still hold a few wins. It has 4 million sellers, and one of them has the potential to hit 2 million. Will the high end PS4 software hit those heights? Time will tell, but I'm not optimistic.