It's a console in its final year, and... my excuse is that I don't have a 3DS. I had the opportunity of playing Samus Returns in my friend's 3DS though, so I actually buy a game 50/50 with him. I sold it because I thought that the support was over, but I was totally wrong about that, so it's my fault.

I know.  I thought that it would do well since it was basically 'Tomodachi Life RPG'.  I guess either the spin-off lacked the magic that Sakamoto gave to the Tomodachi series or people can only handle one quirky 'mii-focused life sim-type game' per platform -- or it's a late cycle game and the only people buying 3DS's now are late comers that just want to buy from the 3DS's backlog of games while everyone else is ready to move on.

DQXI sold almost 2 millions and was released this year.

I hope they take this as people want games on switch and move the development of 3DS games to the switch and not that those games on the 3DS didn't do well and quit making those games.

Miitopia probably would have performed better had it not taken so long for them to port it...
I intend to get Pikmin when the price drops...
I was really looking forward to Ever Oasis but then the Switch got in the way...
And I hope to get Metroid very soon...
And I still intend to get Fire Emblem eventually, but I still haven't finished Fates, and I don't know when that's going to happen...

This.  New software shows the consumer base that the system is still worth buying.  If Nintendo didn't support the 3DS with new games this year, the bottom would have fallen out of their hardware sales.  By supporting the 3DS, they've been able to move more hardware on a weekly basis than Microsoft has with the XBox One for 2 the last 2 straight months of tracking info, despite the 3DS being 2 full years older.  

Dunno why Nintendo fans are so deadset on killing the 3DS. I thought graphics didnt matter to this crowd

I bought Samus Returns, and I plan to grab SMT Strange Journey and Persona Q2 next year, so don’t look at me.

That's a good indication that most Switch owners are/use to be 3DS owner.

I still wonder what Nintendo is going to release alongside the Switch.

Mario and Luigi, Samus Returns and Mario Party might reach 1 million. My bet is at least one of them will.