As far as editors wanting to string out the stories of the Main 3, I suppose it might be true. We do know that editors influenced a few things in the Naruto storyline, from the creation of Sasuke and Sakura, to the extra scenes given to Sasuke's teams. With bleach, I'm not really sure. Kubo revealed that the Arrancar arc could have been the end of bleach if the editors decided to stop bleach serialization. But since bleach, and the arrancar arc, were so popular, there was no way they wanted to stop its production. Kubo said he had 10 more years of material he would cover, so it doesn't seem like he was ready to quit either.
I'm actually glad Bleach continued, there were too many unanswered questions, Chad's powers, Yachiru's namesake, and Isshin's past being a few of them (I'm glad the new arc responded to one of those

). Plus, I'd be royally ticked if we never saw Grimmjow again. Getting blindsided, protected by Ichigo, and just disappearing off-panel is hardly a decent conclusion for one of my favorite manga characters.
The only thing that really annoyed me is how new villains are still being introduced. Aizen always struck me as the 'villain to end all villains' in Bleach. It's sort of reminds me of DBZ, it was really hard for me to stay interested in villains like Cell and Buu after they fought Frieza for so darn long.
But who knows, maybe Aizen will return somehow.
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I used to be extremely passionate about Naruto, but anymore it doesn't appeal to me nearly as much. It started a pretty horrible downhill after the Pain Invasion arc, and hasn't been able to pick up my interests since. I suppose I read it hoping things will change....and that it is something to do, lol XD I feel pretty sad about how things have changed since I used to love the story and its characters so much >: One thing is sure, Kishi is really trying to incorporate some pretty heavy ideas in his story.
I sort of agree with this, though my interest kind of wavers with the arc I'm reading. The Iron Country Arc wasn't my favorite, but I loved the Confinement Arc. I didn't think I'd grow to like new characters this late in the manga, but Kishi proved me wrong Kushina and Bee, whose pasts were really delved into in that arc.
The current War Arc feels kind of drawn out though. Bringing back every old villain, and a bunch of other random enemies, for the heroes to fight one on one at the end just seems boring after a while. Stuff like that works in video games, but it doesn't really interest me as much otherwise.