As far as why they are on top software wise _this_ week? Puzzle & Dragons Z + Super Mario Bros. Edition (3DS) first week, Xenoblade Chronicles X (Wii U) first week, Dragon Quest X: Mezameshi Itsutsu no Shuzoku Online (Wii U, 3DS) has good legs.
Not saying Nintendo doesn't have good software to push right now but it is far off from dominating this year and does not meet the technical definition of dominating this week either.
Oh and holy shit yearly software sales for all platforms. PS4 and PS3 hold the top 2 slots. PS3 and X360 are having good software sales still. PS3 will probably pass Wii lifetime software soon and X360 already has.











