You have yet to disprove the original statement, so calling it wrong is rather rash.  Yes Switch has two big games (Zelda and Splatoon 2), one unknown (Arms), an updated port (Mario Kart 8) and a bunch of games that may not make it out of Japan, and indies that I have already mentioned don't move systems within the first six months.  Keep in mind that people thought that PS4 had "no gamez" or whatever the meme was in its first year and it looked much better than the Switch has shown thusfar for the same timeframe.

When you have two systems (3DS and Wii U) that have issues with software at launch (3DS) and throughout the life cycle (Wii U) you begin to alienate your fanbase.  Thus, your home console doesn't even get to 15 million sold.  Switch will do fine in Japan.  It is everywhere else that becomes an issue.

You have the home console people who are looking at it like a handheld and thus aren't interested.

You have the handheld console people who are looking at the battery life and price and thus aren't interested.

You have the people who play mainly for third party that already have the console they are going to use for that and thus aren't interested.

Then you have the Nintendo fans, and those who like the idea of having it on the go and at home, that they are targeting.  Is that number enough?  Based on what they have done in the past, and the necessary changes to their most recent handheld to get it off the ground, I don't think so.  Can it surprise us the way the Wii U did?  Sure.  Is it LIKELY to?  No.

They are relying on motion controls again.  The motion control crowd hasn't cared for over 5 years now, they have moved on.  7 games at launch for anyone not in Japan is a weak library that is relying solely on one game in Zelda.  Everything else on launch date is very much a gamble.

My statement that they might not do so well outside Japan is not wrong, it is an opinion based on the facts we look at since Nintendo lost a ton of third party support generations ago, and the message they attempted to convey at their Switch presentation.  Do you really think there are people foaming at the mouth to "milk cows" with 1-2 Switch at parties?  Or that they are super excited to double dip on a game like I am Setsuna?  I don't.

Yes I did disprove your original statement, if you forgot what it was than that's on you. Everything you have said since then is irrelevant to the original point.

Full of wrong assumptions that Nintendo failed with wii u 

yes you are understanding incorrectly considering you only quoted half the sentance.

Oh you mean the part where you are crying out "handheld handheld!" when Nintendo is marketing it as a home console on the go?  You're right, you completely dismantled my point.  Whatever could I have been thinking!

And in case you didn't notice, that was sarcasm.  You haven't provided anything of substance to prove your point at all.  Japan is the go-to for handhelds.  That is fact not opinion.  Japan is a video game market in decline.  That is fact not opinion.  For Nintendo to be so Japan heavy (12 launch titles vs 7 for not Japan, again fact not opinion) is a mistake (the mistake word is an informed opinion).  You want to refute any of that with anything better than "3DS outsells Wii U", im listening.

Your original statement was that handhelds arent a selling point outside of Japan and that we can use that to predict it will sell like Wii U. And yes 3DS selling 4x as much as Wii U outside of Japan directly disproves your point. Switch could sell like Wii U but it won't be because handhelds hold no value outside of Japan.

Also 7 launch titles is outdated info.

It's not my thread, and I don't know who are that people assuming Wii U failed because shitty graphics, but the definitive rebuttal is there in my post. As I mentioned, there are other factors, but I want to believe that OP is tired to see the old "shitty graphics" is the only reason to fail.

Lack of power is something more sophisticated to say, and it holds true. But it was only one of the hundreds problems that Nintendo had last gen (and some looks like to be still on the Switch).