
The whole age thing.. well... I don't even know. I guess it's every mans opinion for himself. (Or woman. or.. dog? or..cat.. or ninja )
If he woke up at the last moment, well, I really don't know what to say to that. He'd still have to pay the consequences for what he did. It doesn't really make a difference if he died. If he died, it'd be a clean slate, the Uchiha name would be free of its burden. But if he lived it'd be the cycle all over again, and plus, he'd be locked up and his head would be on bounty for a lot of ryo, I assume. Not so much on the Leafs part... but maybe on other villages and other countries. Thus continuing the chain..
about the first part. sasuke went through stuff JUST as bad as gaara.
sasuke wasnt evil when his clan got killed, he didnt hurt anyone because of it. what did he do? he tried to get stronger, which was harmless at first. same with gaara trying to get along with other people but got shunned. sasuke NEVER took his anger out about his village on anyone, but kept it to himself. (when he was a kid like gaara)
only when orochimaru put the curse mark on sasuke did all this anger inside of him come out. and he ended up joining him.
and its okay if sasuke faces justice. theres nothing wrong with that? its something he might need to do. or he could escape and become a wanderer teaching kids of how to stay on the right path and not going to the dark-side like him.