AP stylebook now allows the "singular they" in some instances

[d_r]

@temp

If our culture ever changes sufficiently that a non-binary third person singular pronoun is sufficiently necessary that it becomes standardized, I do not believe it will be “they.” My vote is for “se.”

It will almost certainly be “they” as that is the one that is actually being used. All the other ones that have been proposed have failed; they are not fetch enough.