It's hilarious how some people in this thread seem to be genuinely getting upset that some others don't think the PS4 will outsell the Wii lol. It's like they're taking it as a personal insult to their all mighty PS4 and must defend it.
OT: I'm not sure if it will outsell the Wii since I haven't payed attention to numbers, but if it does outsell it then it outsells it. If it doesn't then it doesn't. It's at 60 million right (or correct me if i'm wrong and maybe it's higher or lower) now though so if it kept selling at least 10 million a year then sometime around 2020-2021. Depends on when Sony releases a PS5 though since apparently some rumors are coming out now about 2019 and that could dig into the PS4's sales massively and also how the Switch is out and could continue to sell amazing if Nintendo keeps up momentum and increases supply, and Scorpio is also a factor depending on how that is receieved.