Yes, Sasuke (or Naruto) will make it happen somehow
Yes, but only once Madara is totally defeated
No, he will spit on their face until his last breath
No, he might stumble a bit on the reflection but will push his plan forward
uh well..... i don't believe some actually are considering the probability of sasuke dying by that stab. how much i dislike sasuke, i must admit that he has a major role to play in current situation. he got Hashirama's chakra () and probably a jutsu as well; he just won't die simply without doing anything.
i am thinking about what Gaara is going to do with Naruto. may be he will throw him in the mouth of that giant statue or something ()
Sasuke gave up his eyesight before by overusing his Mangekyou abilities...