I don't get why so many people can't seem to understand such a basic concept like - games sell platforms, and right now, Wii U simply doesn't have them. This has always been the case, and it will be no different for Wii U. Think about why you've gotten any game console you've bought. I'm willing to bet it was because of a particular game, or games. Consoles are nothing more than machines designed to play games. That is their puropse. So obviously, when more and better games are released, their sales will naturally rise.
Will games like Pikmin, Wonderful 101, Lego City, Monster Hunter boost sales? Probably not very much, but the fact is anyone who wants those games and doesn't own a Wii U will pick one up for them. Its sales are going to go up, hell they really have nowhere to go up at this point. Just a matter of when and how much. I personally don't think they will boost significantly, as I simply don't see the huge hits and evergreen type of titles the Wii had. The closest thing would be Mario Kart, Smash Brothers, Wii Fit, and I guess you can look at Lego City as sort of a wild card. But Nintendo needs NEW franchises to draw the mass market back. They need a new Wii Sports, and by that I don't mean a sequel but a brand new game that returns to the Wii philosophy of simple pick-up-and-play games.