I'm impressed, yet not surprised, since Minecraft is such a good game.
Wii Sports has sold 81.98 copies. Seeing the difference in sales and release dates, I'd say that Minecraft will beat Wii Sports in 4 years.
The official wikipedia page does not combine the sales from these, as they are separate games.
If we want to change it so that these games are counted as one, it would require all other games in series to be combined as well (ie- all CoD game sales become lumped together), which would just push minecraft back down the list anyway.
... Well, I only checked wikipedia for the others than Minecraft, and it does combine all the consoles, like GTA San Andreas lists PC (Microsoft and Mac), Xbox, Xbox 360, PS2, PS3 and mobile.
Though Super Mario Bros is 40.24 million, and it only says NES, so it doesn't include on Wii or 3DS or anything, so I guess, that it might push Minecraft down.
Nevertheless, I still believe that Minecraft will come out on top within a few years.