I doubt they’d trust another company with a “mainline” Zelda game. The IP is too valuable to them. I could see more Hyrule Warriors type games but I reckon Nintendo will keep most of their main development in house, and I’m not sure they want to make that kind of game anymore from what they say, so I wouldn’t hold your breath. One thing I wonder about is what’s next? They made two great open world games now and maybe they’ll move on from that formula too. But to what? Who knows.