No new IP's you say?
Steel Diver
Nintendogs
Xenoblades
The Last Story
Endless Ocean
All ones that come to mind immediatly as new games in the last 5-6 years
As Wertville stated multiple games you just mentioned were not Nintendo 1st party titles.
Xenoblades and The Last Story weren't developed by Nintendo.
I have no idea about endless ocean.
Anyway, it's not nearly as easy as it seems to make a new IP. I think one from Miyamoto per generation should be enough, and the Wii games were, IMO, quality enough to be included.
It's pretty easy for someone like Miyamoto to make a new IP actually, the word "No" doesn't exist when developers like him approach someone with an idea. His name alone assures that he can do pretty much anything he wants and that goes for all the "Legendary" developers in the gaming industry. I have to completely disagree with his IPs for the Wii generation being of any quality, the only three games that were new IPs that Miyamoto was involved in for the Wii were Wii Sports, Wii fit and Wii Music, none of which I personally found appealing. Wii Sports was okay but was a bit annoying because of the Wii's sub par motion controls at the time. Wii Sports Resort was an improvement with Wii Motion Plus but Miyamoto wasn't involved in that game.