Can Mario Kart 7 Hit 15Mil Lifetime in Sales?

[PAOerfulone]

They update it every 3 months at the end of every financial quarter. Usually at the very end of the next month.
So, expect June 30th numbers by the very end of July-begining of August. 
There's a very possible chance that Sun/Moon will have eclipsed X/Y as the #1 3DS game by then.