I really love BotW. The only criticisms i have would only be defined as opinionated nitpicks, so if this is what 3D Zelda is for the next 15+ years, i'm gonna be fine with it.
I do think that future 3D Zelda games will now be all open world like BotW. BotW is that OoT style shift we had back in the late 90s that served the series perfectly well for a long time before it started to get stale.
So, if we accept that the next Zelda will be a massive open world game, what then can be changed from BotW? Will the game still be physics based? Is that what defines BotW more than its open world? Will we still be able to climb everything, thus making the world feel free? Will they keep the engine from BotW and simple create a new world in a new tine with new characters with new runes?
I really cant say. The BotW style is in its infancy with Zelda, its hard to grasp what it is Aonuma would want to do differently next time.
I dont want to see a multiplayer 3D home console Zelda. Multiplayer Zelda in my opinion has NEVER worked.
Defining BotW's identity. If its the physics or even the runes, will help us think of what could possibly come next. The runes are tied into the Sheikah Slate, would another game set in a different version of Hyrule at a different time be able to still use runes? Are runes how items will be used from now on or was this simply a once only thing for BotW? Its impossible to tell.
What i'd like to see is for the next Zelda to keep the BotW system; the open world, the runes, the freedom but have it all different. Much like how Wind Waker was different from OoT yet played very similarly.
For the world I'd like a thriving Hyrule. Show us a grand kingdom with tall spires, crowded market places, rich races and a sprawling landscape of mystery that is very much alive. Weve seen a destroyed Hyrule now let us see the definitive example of a golden age in a 3D game.
For the story, keep doing what theyre doing. Aonuma (if Shigsy stays out of it) can craft a wonderful Zelda story. Keep the option of doing as much or as little as you want. Have there be a story but dont have it be intrusive. BotW did this really well i think.
Gameplay, again I'm happy to play a 'refined botw' like what TP is to OoT, add things in, iron out those small kinks, give us everything we had and more in the next game. Dont do something wild like forced multiplayer.
I think the BotW style is here for quite some time, probably until the next shift in gaming like the third dimension, or the ability to craft worlds on such a large scale. And i'm happy to play a few more games similar to BotW for the next decade or so, so long as they keep enriching the franchise. I dont really need or want the next Zelda game to be another revolution, i'm happy with the next game just being an improvement on the one before.