But there's not much risk here. They don't have much to lose at all vs where they were in the N64/GCN days.
The newbies can come and go, but they can keep their loyal bitches on a chain forever. I count myself among them
They won't 'lose' those folks even if the house comes tumbling down. No matter how neglected 'we' might feel, 'we' will always line up for Nintendo hardware for Mario & Zelda. We may go elsewhere between times, but we'll always be there for their 'traditional' games.
They know that. They know they can take their eye off us and we won't go anywhere. They care about us to the extent that, yes - we are their 'bad-times security', always there to help at least keep them ticking over, but they're by no means worried about losing us. And we're not a growth opportunity for them. And they don't need us, nor 'broader' core gamers to sustain massive growth - quite clearly now.
So no...I don't think they really care about third parties catering to us on their platform. They know their own stuff is enough to keep a certain guaranteed minimum of support from 'core Nintendo fans' going into the future. The 'broader core' aren't so loyal anyway either - why spend more money on this group if you can spend less catering to others and more of them? Their new market is far more satisfying - cheaper to dev for, and seemingly boundless in scope - and only a little less loyal than 'regular core' gamers. 'Regular core' are an inefficient target next to their new audience, and carry no greater guarantees about future support if the newbs abandon them.