As it is unfair to put it up against 3DS I will stick to its actual competition, being home consoles. On that front it is very likely to be number 1 on launch week, and possible week 2 as well if there is nothing special on for Wii U that week.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix