Not now, not ever.

Few years ago I would have said no, but know I can say yes.

The only things that can make me prefer digital over physical are GOG DRM-free versions (that already allowed me to play old games whose DRM was incompatible with newer versions of Windows) or, if DRM can't be avoided, dirt cheap sales on Steam and other DD platforms. But surely those cannot fill all my gaming needs, so I still want to have the choice between digital and physical.

...You made that up. There is absolutely no research supporting that what-so-ever because there's no rubric deciding who is a hardcore gamer and who has access to adequate internet speeds within that group as opposed to outside of it. PSP Go was a late revision of a system already falling in its sales that had no reliable way to be consistantly connected to the internet as it required wifi and had no data plan. Ouya was the Ouya. People need to stop using bad products as examples of the undesirability of good ideas.

That shouldn't matter since the NX is using carts.

Exactly this.  There is no way of knowing that the games you download will be quality.  So they would have to offere refunds on games in the first few days to keep people from being stuck.  Or the games will need to be considerablely cheaper than they are now. 

I've been buying digitally on all of my 8th gen platforms for a while now, so yeah I most likely would.

Yes, as long as it is cheaper than the main console. I am going full digital soon.

Of course yes, I prefer not to give my money for retail.

Yes, but not at launch.

And it would result in me buying less software. For example, I'd only buy Mario Kart on Nintendo, and Souls games and Naughty Dog games on PlayStation.