Only for story-related purposes. There is that loose end of the throne of Outworld. After all, she was Shao Kahn's legitimate successor, and Kotal Kahn now has the throne, according to initial sources.
I still hate Mileena, I still think she's a slut, and I personally want her gone, but a loose end in the story is a loose end in the story, and she is necessary to clear that up. Once that loose end is cleared, THEN we can discuss her fate in future games.
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