If a gamer wants to consider buying a next gen platform and is only considering software (not hardware specs) then it is easy to say the gamer would realize the Playstation 4 library of exclusives holds far more depth and even quantity in number of titles than Nintendo's first party offerings.
So then if you are arguing software will increase Wii U sales, how about comparing software between the Wii U and the other 2 next-gen consoles?