Possible *SPOILERS*.
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When Yuna summons her Aeons one by one during the final battle, it seems to me that she's in pain, and it keeps getting worse.
I actually would've liked it if her feelings were hurt so much that it left a kind of "wound" or whatever in her soul forever.
Oh well, if FFX-2 weren't to continue the game, it would be a very moving way to end it.
Think about it! - Yuna travels with her Aeons for a long time, and her bond with them grows to a kind of love.
Then, she has to sacrifice them and defeat them, and this would definitely be painful.
I would kinda like it if she was hurt so badly that she never fully recovered.
I might sound sadistic, but it would be pretty touching.