This discussion's been had. I bet anyone familiar with it can't guess what I'm about to say...
Enough! with the cel-shading. It doesn't do it for me. Not that I expect ninty to ever make a zelda game that appeals to me again, but come on. It's been done. It's cheap. It's lazy. It looks poor. But ninty doesn't care because they can still sell enough to make bank regardless of how it looks. BotW's financial success will only reinforce this. ninty isn't going to splurge on sophisticated graphics even if they knew how, and it's apparent that they still don't know how to achieve modern graphical fidelity.
I also think it's too late for the Zelda series to appeal to core gamers. That opportunity passed with Suckward, BotW only convinced core gamers outside nintendo that the Zelda series isn't worth their attention. Even if ninty endeavored to develop a Zelda game that lives up to the modern standards core gamers expect, it wouldn't catch on with them. This is a shame because the Switch was set up to catch mainstream attention and ninty hasn't followed up with that momentum and made good on sophisticated showings that can appeal to modern gamers. Zelda was one opportunity for open world fantasy, Metroid was another for core shooters. Maybe it's not too late for core gamers to find Switch appealing, but I think they know too much about the Zelda series by looking at BotW to consider Nintendo as a suitable alternative to PS4. Zelda still won't be unseating the likes of Elder Scrolls any time soon.