From a business perspective, I hope the Wii U rockets in sales.
From a gamer perspective... I hope it stays mediocre. This may sound weird, but I feel like (first party) publishers give us way better games and better deals when their systems are struggling, and they don't try half as hard when their systems are widely successful. Look at the offerings Ninty gave us on the Wii. Then look at the N64 and GC. Now look at the amazing deals Sony is giving people on the PSV....
I don't want the Wii U to die, by any means, but if it does "okay," I'll be happy... I mean hell, we probably wouldn't be getting an HD Wind Waker remake right now if Nintendo didn't feel so pressured.