Having thought about it some more, if this is used, the player should get to choose which stat to roll based on whatever criteria they want.
In response to Daniel Wood's question - I'm sure a lot of AW games would end better without an epilogue, and many would work better with a totally open one. I find it's easier to improvise story when I'm working with some constraints. Also, many of the games I like have a game ending procedure defined. I don't think Apocalypse World should have a single officially correct answer, but I do think it would benefit from having options laid out.