And why does it have to be Nintendo that comes up with the new IP? There are plenty of other new IPs that Nintendo has published from a third party or that third parties have provided:
Professor Layton, Hotel Dusk, No More Heroes, Viewtiful Joe, Super Monkey Ball, Trauma Center, Ace Attorney, Rock Band, Guitar Hero, Epic Mickey, De Blob, Billy Hatcher, Zack & Wiki, Dewy's Adventure, Elebits, The World Ends With You, DQH: Rocket Slime, Meteos, Boom Blox, Cubivore, Rhythym Thief, Henry Hatsworth and others as well. Maybe some of those games aren't that great or only needed one release because that's all that can be done with them. Some have been run into the ground or now dormant but they were all new IPs after the 64.
Why is there never talk of this but only what Nintendo brings? There are plenty of new IPs to experience if people will look for them but why the narrow focus as if Nintendo is doing nothing to expand their frontiers. With the amount they've got, they've started skipping generations before releasing a new iteration of some franchises and yet they need more. Gamers are insatiable.