This is the first interesting idea you've proposed. It's also wrong.
Nintendo isn't going to ditch the 3DS out of hand. It would be foolhardy to do so at this juncture. But they aren't also going to go all-in on a DS successor when they are currently launching another portable system. A New-New 3DS is only possible with the utter failure of the Switch. Granted, this seems to be something you are quite keen on, and fully expecting. But as it stands this is the only scenario that could lead to another DS. Where is the GameBoy line right now? It was supplanted by a successful DS line. If the Switch has solid first-year sales, it will prevent any successor DS system from appearing.
As to my personal arrogance, I'll readily cop to that. I have a strong tendency towards a swelled ego. But you can't really blame me under the circumstances. You haven't done a single thing to refute any of what I've posted. Incoherent, unfocused rambling walls of text do not constitute an argument.
The basic hypothesis I've put forward is that the Switch will do better than the Wii U, but will likely sell less than the Wii in a similar time frame. I understand that this is a difficult position to oppose. When you actually look at it, it's a very reasonable prediction that constitutes a huge swath of outcomes. The Wii U sold only around 13 million over the course of 4+ years. The Wii sold 100+ million over roughly the same time frame. That's an 87+ million spread to cover. Not exactly an ambitious prediction. It's a safe, conservative estimate with plenty of common sense to back it up.
Your assertion that the Switch will be another Wii U, and will perform as badly or worse, baffles me. And you still haven't provided any solid reasoning to back up your claims.
Again, you're putting words/thoughts there that I didn't say. I think we're actually in more agreement than you think.
I never said Nintendo would ditch the 3DS. I absolutely agree with you; that would be foolish. My post was only imagining a remote possibility where Nintendo might release a successor to the DS line. Of course, even if it did happen, it wouldn't be anytime soon. Nintendo should and needs to be committed to the Switch (though based on some of Reggie's comments, I'm not sure they are).
I also agree with you about the Switch. You seem to think I am arguing it will sell less than Wii U. I never said that. In fact, I've said it looks like a 15-20 million console. That's better than the Wii U, and I agree it should sell more. But I'm not sure 20 million would be seen by many to be a success. The Wii U set the bar low, but just beating by ~10 million won't sit well, and it may only further prove the Big N's base is ... well, small.
Anyways, it'll be fun/interesting to watch. I don't game too much anymore; I'm more fascinated by seeing how the industry rolls, and evolves. There really are few business like it, and the players are intriguing to watch as they compete/jockey for position.
As I've said elsewhere, I'm a long-time Nintendo gamer. Have every system since the NES; bought Gamecube on launch day. Also have the Wii, two GBA (still enjoy some FF Crystal Chronicles now and then), the 3DS, and (yes) the Wii U. Have 25 games on the system everyone seems to hate.
I've said my piece on the Switch, and I'm done writing in this forum as well as any others as they relate to this machine. I hope the console does well. I hope we get amazing Nintendo games (we will). I also hope Nintendo does better at E3 to convince people to buy it.
That all said, my hope is largely clinging to a very small likelihood.
I think the Switch is going to be a debacle (meaning 15-20 million sold). That's not enough to maintain an ecosystem, and certainly not enough to get the AAA developers on board.
It'll be Nintendo's last proprietary machine. Sad, but that's the writing on the wall (IMHO).