Another thing to consider is the Virtual Console. Take a game like Mega Man X -- released originally for SNES, it represents Capcom's support for that platform. But it was also released for the Wii (and, later, for the Wii U) through the Virtual Console. Is this not representative of some manner of support for those consoles? Even if we were to disregard this game and many others simply because they were already released on a previous Nintendo platform, that does not account for the handful of Sega Genesis (among other retro platforms) titles such as Sonic the Hedgehog making their Nintendo console debut.
There's no denying that to support the Virtual Console is to support the platform that is host to it. But I don't know how we can measure this support against actual newly developed titles of varying quality. Considering all of this, I believe the Wii might actually rival the GameCube in terms of third-party support, while the Wii U quite simply blows the N64 away.
Please, someone offer a legitimate reason to consider the N64's third-party support superior to that on Wii U.
