Haven't they made quite a few since the start of gen 7? However most people just tend to discount them due to arbitrary reasons. Off the top of my head I can name new IPs like Xenoblade Chronicles, Soma Bringer, Wii.., Nintendogs, Brain Training, Pullblox/Pushmo, Dillon's Rolling Western, Maboshi, Disaster, Marionation Gear, Endless Ocean, Steel Diver, and probably several more I'm forgetting.
And I wouldn't classify Nintendo and the likes of Ubisoft in the same league to using/abusing franchises as I would argue Nintendo uses theirs quite prudently. For example, there has been only one Mario Kart, NSMB or Smash Bros per generation. This is unlike Assassin's Creed which averages over 1 instalment a year. I'm not saying Nintendo hasn't done that on occasion (Mario Party in the 6th gen comes to mind), but it is more of an isolated incident.