Woah, they are hiring a level designer, that is crazy. 

If Nintendo really wants to innovate, they're going to have to hire an actual dungeon designer for the next game. 

The weird thing is that despite my love for BotW—it's my new favorite—I can see a lot of room to grow. These things would be my requests, in order of priority

1) more (optional) dungeons, with unique enemies and loot. These wouldn't be like Divine Beasts or the classic use-the-dungeon-item-to-defeat-the-boss variety, but something akin to dungeons from The Elder Scrolls.
2) A New Game+ or the ability to return to the game world after the credits roll. I get that the narrative of BotW makes a post-Calamity Ganon world tricky, but I missed being able to return to Hyrule, or (even better) play as Zelda in a kingdom-reconstruction game.
3) A few underwater or sky-bound areas to explore 

Someone on ResetEra did some translation and came up with this:

"The 3DCG designer's primary roles are the creation of terrain and topography for fields and dungeons, as well as concept art. The level designer is being hired to plan enemy placements and dungeon layout."

Source

So it could be good news! Of course, it could be for a remake/remaster, too.

PLEASE NEW DLC!!!!

As I've posted a while back some things to look into while building on BOTW:

- Underwater, out at sea and sky based areas.
- Loftwings added as a mount.
- The option for players to take weapons somewhere to be repaired for those who struggle with durability management.
- More player houses to buy and places to build new settlements with each new settlement being taken up residence by travelling npcs opening up new quests, shops and items.
- Bring back the BOTW spells as they were useful and maybe see if ones like the painting ability from ALBW can add anything.
- Either adjust the weather to reduce rainy weather or add an item which prevents slipping while climbing.
- BOTW DLC wasn't bad it was merely decent though especially in the wake of DLC like Blood and Wine from TW3 and the recent Torna from XBC so that should looked at.
- Definitely need a new game plus mode although Master mode did a good job filling that role.
- More variety in enemies.
- More weapon types (scythes, staffs etc...)

They can turn Zelda into their own GTA/RDR if they handle things right BOTW has already opened that path for them and although the future games may not be as ground breaking as BOTW is another OOT moment if they do what R* do and continue to refine and build on the approach they could find the series consistently selling 10-15m plus.

More houses is a great idea! I’d like purchasable real estate in each town.

There should’ve been DLC where you rebuild Castle Town.

damn lol i need to get back on this and do the dlc content

Seeing as how GTA V and RDR2 were able to sell 10-15 million during launch week, and far, far greater than that during its lifetime, Nintendo would have to royally screw up the BOTW formula in order for games to sell that much during its lifetime. As it stands, Breath of the Wild could very well reach 20 million on the Switch alone by the time Switch 2 launches!
If they play their cards right in making Zelda into their own unique GTA/RDR type franchise, I could see each open world Zelda game selling between 30-40 million. About the same levels as 2D Mario and Mario Kart during the Wii/DS days!

On the topic of what they could do.
The only thing I really, REALLY want (beside better, Twilight Princess/Skyward Sword tier dungeons) is a post game campaign which takes place after you beat the game. Once you beat the final boss, you've just unlocked a whole new set of side quests, dungeons, shrines, town missions, etc. that centers around rebuilding Hyrule and you're helping Zelda pick up the pieces and restoring peace and prosperity to the land.