Like the other comment says, “they” already exists in English.
So I’ll answer for my own language, German, which actually doesn’t have a gender-neutral pronoun for people. Personally, if people wanted to start using such a pronoun, I wouldn’t have a problem with it. I also think, however, that this sort of language change can’t be forced and if the majority of people don’t want to use it, there’s nothing to be done about it. So far, any attempts to establish such a thing were widely ignored, so I don’t think there is much demand among the population to have one.
As a sidenote, it gets really awkward when German translators have to translate a non-binary person’s pronouns into German. There is a scene in Star Trek Discovery where a character comes out as non-binary and in the German dub, they’re using a combination of the English “they” and the German plural form to address them. Sounds extremely strange and stilted, most Germans were probably quite confused by that scene.
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