NS...is this even a question?

Waiting to see what the Japanese call it. They're experts at this.

I like Swii to be honest. I think I'll go with that.

Nintendo 64 was abbreviated "N64", so I would say "NS" makes sense for Nintendo Switch.

Not the Wii U 2 since it is fundamentally, at the foundational design level, different than the Wii U. People saying it is similar to the Wii U are just plain incorrect. Just because you can have a gamepad-esque thing does not mean they are the same. They aren't. They are different at the very core of their design philosophies.

I would call it Switch

Death Toaster 3000

Most of us will call it the Switch. The name is fine.

I'm already calling it NS, so I'll probably call it that. The Switch is probably fine enough as well.