This could definitely be called an RPG. It even kinda starts out like an RPG:stuck in a cave armed only with your underwear. While I was playing the demo, I encountered enemies that were WAY above what my equipment could handle, and when I tried to fight them they stomped me. Twice. This is a lot closer to an open world RPG than a traditional Zelda title. You just level up through better equipment that you make, discover or scavenge rather than through XP. This isn't like other Zeldas where,you find equipment JUST to reach the next dungeon.

The witcher is iffy, there is still enough customization with regards to Geralt (you can choose to focus on different  combat roles and progression) that I'd say it is an RPG. Most of the role-playing is in the story - you choose how you interact with the world and what kind of person you are. Mass Effect allows you to choose the role and appearance of Shepard, so I'd call it an rpg quite obviously. But if that isn't enough, it allows you to interact with the world via different story options. It allows you to determine who Shepard is. 

Does Breath of the Wild have a skill tree, story choices,  or an option to differentiate character progression at all? No. Then it is hard for me to call it a role-playing game. It is an action-adventure through and through. 

a rpg doesn't need a skill tree, if link can learn different moves like on tp and wind waker that's enough, plus the variation of weapons is huge compared to a normal action adventure game, you can use a rake if you want.  story choices and character progression? this is a quote from miyamoto  "I can’t talk much about it, but one of the things we’re working on right now is that, as you play, the world will change and be affected by what you choose to do"

I disagree. The whole point of a role-playing game is that you choose how your character(s) grow(s) and develop(s). If there isn't an option to focus on a certain role, then it isn't a role-playing game. Just being able to choose a predominant play-style or learning moves (linearly) is not enough. If that were the case, every action-adventure game would be an RPG. 

As for the Miyamoto quote, I don't think that has much to do with the story giving you options or moral dillema's which describe who Link is, and much more to do with opening up new story segments by completing pre-requisites. 

But as I said, "Depends on how you define RPG. " 

Probably not. No deep narrative, grinding, farming or character development to call it a JRPG. I don't think it will have a WRPG's freedoms like branching paths, multiple endings or customization. I doubt it could even pass as a hybrid/bordeline action game like Mass Effect or Dark Souls.

I think is the same as say Monster Hunter. 

There are action games with RPG elements, but just having some "elements" of a specific genre doesn't make it of that genre if the main core element is missing, which in the RPG case is a level up system.

Wouldn't Zelda be a JRPG because its made by Japanese developers?

Like how Pokemon is a JRPG?

I do not care what we call it. It looks fun.

JRPGs are just a variant of the RPG genre that was created in Japan, hence the name. You can have JRPGs made by western developers and reguar RPGs made by jap devs. Dark Sousl is a RPG, is made on Japan but its definetly not a JRPG.

To the matter at hand, if you go with the definition that RPGs are games were you interpret a character than every videogame is a RPG, you always interpret a character that isn't you on every game (even when they are meant to be you, they are an incarnation of you in the game world, therefore you are roleplaying). If you go with the definition that a RPG is a game that lets you customize characters than that only limits you to like 90% of all the games in existence as pretty much every game offer some form of customization. Therefore on videogmae terms  RPG is based on game mechanics, the centerpiece of those mechanics are a character progression system based on experience that you colect as you kill monsters/do certain activitys etc. Zelda does not have that so its definelty not a RPG, it has other RPG elements tough like looting and monster levels. 

Everything can be considered an rpg if you can increase your stats