I know, right?
Sasuke IS meant to be a genius, but even this is a little too much. Of course, I fully expect Sasuke will have to pay a heavy price for all that power; Kishimoto has already hinted that Sasuke will lose his eyesight. If Sasuke is still alive at the end of the manga, he'll most likely be blind.
Maybe, but I doubt it'll be permanent. I can see the overuse of his Mangekyou giving him fits later on. I think Kishimoto already started forshadowing and it doesn't seem Sasuke has made the connection between his weakening sight and the Mangekyou. Perhaps when he's facing Naruto or Madara. However, my expectation is that if it does happen, either it'll be to a degree and at a time that'll stop Sasuke from being a Mangenkyo spam machine or that his sight will be restored in some manner.
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Zetsu's backstab was most likely the final straw. Sasuke was already teetering on the edge, consumed by his desire for revenge. Having Danzou dangled before his eyes - then snatched away - has just made Sasuke lose his patience and become extremely annoyed. It's clear Madara had that happen on purpose so Sasuke would cause chaos at the Kage Meeting. The question is, why? Was increasing Sasuke's power the sole aim, or was it just a nifty little bonus for him?
EDIT: Cupcake-chan, Naruto is staying at the wooden lodge Yamato created. They're most likely miles away from the Kage Summit building.
This is ultimately why this chapter bugs me so much. His current team has been with him since Itachi's death and his desire to eliminate Danzou. If anything was to be the final straw, I would have expected that traumatic event to be the final straw. Instead, the betrayal of a guy they never really trusted very much and the interference from a bunch of people he never knew (save Gaara and company) are what do it? To me, being extremely annoyed as the basis seems...awfully underwhelming.
Second, this chapter highlights what I've really disliked about Sasuke's powerups. Throughout most of the series we were led to believe that the cost of obtaining Mangkyou was not only exceptionally high, but rather sinister. Sasuke got his when Itachi gave it to him (and not Itachi's actual death...) and the second eye, was apparently released now, though that Susanno'o required both eyes to be released, that they were released separately, and that Sasuke had only one prior to now wasn't exactly clear. Nor is how he knew any of this. Truthfully, I'm not even sure that's what Kishimoto meant, but that's how Sasuke's words came across to me.
For me, how Sasuke got his and how they were supposed to be obtained doesn't exactly mesh. It seems Sasuke paid a far lower price than Itachi. Of course, Itachi being a good guy really calls into question the truth of how Itachi obtained his, since him killing his best friend for power does fit with the current image of Itachi.