Wii U is Nintendo banking on gimmicks again. the last one worked, this one doesn't. expect N64 level sales before a replacement is announced.
The N64 didn't really employ any gimmicks, though. It was hamstrung by the cartridge format Nintendo stubbornly decided to stick with. That forced nearly every narrative-based game onto the Playstation out of the necessities of storage volume. With the N64, Nintendo lost the console JRPG, and haven't recovered it since. In addition, cartridge publishing costs were so prohibitively high that only the most confident of developers could afford to make games for the system. Most who tried got burned, hard. Nintendo burned a whole pile of third party good-will with the N64.
The Gamecube, by comparison, was a much friendlier console to developers. Not as PC-like as the Xbox, but a far cry from the arbitrarily complex PS2. Even so, Nintendo bafflingly opted to stunt the system's disc size, forcing the scant few cutscene/narrative-heavy games to opt for multiple discs. (Killer 7, Baten Kaitos, Tales of Symphonia, MGS, etc) Nintendo had plenty of (great) ports of third-party action games at the time, but couldn't hold a candle to the PS2's more robust, "cinematic" library.
The Wii was actually a product out of its time. It relied on Gen-6 development paradigms that shut out middleware options that became extremely popular with the PS3 and 360. You simply couldn't port games to the Wii--they had to be written from the ground-up for the system. At first, a lot of developers instead opted for Wii-specific extensions of existing franchises (Dead Space Extraction, Umbrella Chronicles, CoD: Reflex Edition)...which they then refused to market against their AAA counterparts. Eventually, due to (understandably) poor sales, even that dried up, leaving Nintendo (yet again) the sole curators of their platform.
If the Wii U is more architecturally similar to Orbis and Durango, then straight ports might be more viable. In addition, Nintendo seems to be more proactive about securing exclusives (see: Platinum games, Monster Hunter
(Capcom Five, anyone?)) than ever before.
In all likelihood, however, we'll see yet another Gamecube situation, where the the Wii U gets a smattering of third-party support, but is largely propped up by a handful of stellar exclusives.
Dunno about you, but that's okay by me. Nintendo won't make BANK like they did 2006-2009, but they'll float along, and the games will keep coming.