I waited a year before I caved and bought the Pro Controller. Wish I'd done it sooner, honestly. Makes marathon sessions of Zelda and Mario way more enjoyable. I'd say take the plunge if you've got the extra cash. Won't regret it.
Highly doubt they'll miss the opportunity to include more complex dungeons, the backlash for the lack of traditional dungeons was loud and clear. Also expecting, and kinda hoping, for an expanded weapon system. Durability was an interesting mechanic but let's get some unbreakable weapons like Master Sword for endgame content!