Won't happen.
September 2016 would be equivalent of September 2009 and the Wii was at 56.140m shipped at that time. We already see the PS4 is slowing compared to the Wii, and it won't be able to match the Wii in total sales in that time frame.
Looking at how even worse this prediction looks, in Q4 of 2008, the year before, the Wii shipped 10.41m units. it went into 2009 with 44.96m units shipped. Then in Q1 of 2009 it shipped an additional 5.43m.
The PS4 can't match those types of shipments. No ands, ifs, or buts. 50 million at the end of 2016 could happen, but before then? Not happening.
Won bet with t3mporary_126 - I correctly predicted that the Wii U's LTD at the end of 2014 would be closer to 9 million than 10 million. http://gamrconnect.vgchartz.com/post.php?id=6673287
