At this point the Wii U is going to have a hard time passing Vita even with Mario Kart and Smash. Its being outsold by it every week and still needs to make up 2 million. Xbox One should outsell both but its sales outside of NA may hold it back for awhile.
And for those of you saying Vita is doing better just because of Japan you do realize that its also outselling Wii U in Europe and "rest of the world" right?
PSN: extremeM
PlayStation Vita Japanese Software Sales (Media Create Physical/ Famitsu Digital)