@bold: The problem is that you’re looking at the characters as if they’re real people and can make conscious decisions, when in-fact every decision is made for them. Sasuke And Sakura had no say so in how many kids they‘d have, which is why Kishimoto is at fault. He decided to give them one child that’s a female and thusly singlehandedly tarnished the possibility of the Uchiha clan ever branching out in flourishing numbers. The Hyuuga clan is still alive and flourishing to this day, the Senju clan is extinct and the Uchiha are truly on their last leg at this point in history. All Sarada and/or Sasuke have to do is die and there goes the entire Uchiha clan. If Naruto and Boruto dies, Himawari and Karin are still around and until they die the Uzumaki genes will live on. Also, the fact that Sarada and the rest of team 7 are already like 13-14 years old, a new addition to the family at this point is fucking useless. Which is why Sarada should’ve had a male twin.
More importantly though, imagine how awesome it would’ve been if a known/unknown rebel group decided to kidnap Sarada’s brother while Sasuke is away. A rescue mission is conducted by the crew and they rescue Sarada’s brother with medium difficulty. A few arcs pass and Sarada has been recognizing how her brother’s been acting differently since his return to home all those arcs ago. She decides to talk to him about it and he ensures her that he’s fine. Afterwards, she never brings it up again and decide to keep it to herself. Anyway, it turns out that the group that had kidnapped Sarada’s brother were working for Orochimaru, and that Orochimaru actually stole his body. Orochimaru would have an Uchiha body that he’s been training in for a few arcs and is capable of becoming a god-tier character and a suitable villain in the series.
^That’s an epic development and one that could’ve risen had the Uchiha clan not been reduced to only Sarada. And that’s just one of the possibilities.^
It’s not as black and white as you’re making it seem, it’s truly about the possibilities that could’ve manifested had Kishimoto prevented himself from being a dumbass. And just know that I’m not against the technology advancement that’s been happening in the series, I’m against the story’s terrible pacing, wasted chapters, asspull handouts, wasted opportunities, shitty artwork, Boruto cheersquad, copy and pasted characters, Konohamaru jonin fodder, War arc veteran fodder, Etc.
To add to that, the fact that the manga and anime have conflicting stories also adds to the convolution of this shit-show
I have to respectfully disagree here. You are making it sound as if the manga absolutely needs an Uchiha centered plot in order to be good. In actuality however, the Uchiha clan could die out with Sasuke and Sarada, and there could still be a great plot.
For example, we could get some new villain whose home/family were destroyed during the war (a time when the villain was perhaps just an ordinary civilian). For years the villain has blamed this tragedy on the shinobi world and bore hatred to all shinobi, but as a civilian he was powerless to do anything against the shinobi.
That is... until the emergence of scientific ninja tools. Seeing the power of the tools, the villain gathered hundreds of followers who bore similar hatred towards shinobi for similar (or different) reasons. This new anti-shinobi group then seizes control of labs everywhere and starts crafting and modifying technology that can defeat shinobi (perhaps stuff like a device that transforms the chakara within an enemy's body into toxins. This could be a way to level the playing field against shinobi such as Naruto who have massive chakara reserves. More chakara would be a weakness in this scenario). With this anti-shinobi technology and their strength in numbers and supporters, the anti-shinobi alliance wages a war to exterminate all shinobi. In short, it becomes a battle for the survival of the shinobi world as a whole.
This would be an epic plot in my opinion, and it doesn't specifically center around any one character or clan.
It would also touch on important world building issues, as it would expose the troubles that people still face as a result of the shinobi way of life (even post war). A scenario like this would also force the 5 villages and perhaps even smaller shinobi villages such as the grass or the sound to collaborate with each other, and this could open the door for us to see how tensions and other relations have developed between the nations since the war.
What's more, a plot like this would involve everyone (Naruto, Sasuke, Boruto, Sarada, etc...) since everyone's way of life is being threatened. As I said before, it wouldn't just center on one character or clan.
The problem that I have with something like the example plot that you gave is the fact that it basically just becomes another Uchiha wank fest (as if we didn't already get about 700+ chapters of that), and it's also too personal to one character or one family of characters. Instead of focusing on grander scale issues (such as civilian oppression by shinobi, or the world problems that persist after the war, or even the threat of the Otsutsuki {which is a world problem since it threatens the entire world} ), we would just be focusing on one family's problems.
To be fair, that is actually one of the issues that I have had with the canonical plot of the Boruto series. We've had too many petty personal issues (namely too many daddy issues). Boruto, Sarada, Mitsuki (to an extent), Chouchou, Sumire, Shinki, Kagura, etc... All of them have had some lame (boo hoo daddy problems), and it is annoying because we could have been focused on real issues instead of the daddy crap (Sumire's was actually fine though).
Anyway, my point is that whether or not the Uchiha clan flourishes or dies out is not really so significant in terms of creating a good plot. Furthermore, I'd say it's actually a good thing to branch out instead of just crapping on everyone else for another hundreds of chapters just for the sake of saying Uchiha this Uchiha that.
