I think the ending is perfectly open for the audience to decide what they think happened.
It was a great way of saying, so what's changed? nothing... its dangerous and if you expect a perfectly tied up ending then your missing the point. Lots of things could have happened.
Personally,
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i think Tony's daughter would have been the one to die; look at the guy leaving to go in the bathroom and the positioning of the spare seat between tony and the bathroom. She would have run in and got shot.
But then a million other things could happen, that's why the ending was so great
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