"Does Nintendo need fresh game IPs or are they good with their current roster of properties?"
Their take, and I agree, is that Nintendo has plenty of IPs already with which they're not currently doing anything. I'm not against Nintendo coming up with something new, but as Ian said, their problem isn't necessarily that they need new IPs, it's that they need to better manage the many they already have. And yeah, all the gimmick shit is completely unnecessary.
As an aside, if they came out with an animated Legend of Zelda or Metroid show that was of the same quality as, say, the Netflix Castlevania series, I'd watch the hell out of that.