The sky is the limit because the system launched first, is the cheapest to make, Nintendo has massive software capabilities and there is nothing particularly "offensive" about the system when compared to its rivals.
It does need a major software push. Innovative, graphically impressive games that get peoples' attention is what's needed. An amazing 3D Mario, Xeno2, Retro's game being something great for the west, a tease of an epic Zelda and some new Wii-like IP that will be fun and innovative for easily swayed gamers who would like something new would get the ball rolling in a hurry if Wii U is the cheapest new console option. That and some solid marketing. If this is delivered at e3 the console could take off and be a huge seller, especially if there is decent 3rd party support. MarioKart and Smash Bros would finish the job.
