Quote:
Originally Posted by elemenoP
I would use that in speech and in an email, and I understand that language evolves and I hope this becomes standard... but... in a real document for distribution, I just can't do it. It's wrong. 
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If the plural you can turn singular and supplant thou, I see no reason why they can't become singular too.
It's already correct, and of long-standing, in some contexts. E.g. "I would have everybody marry if they can do it properly." — Austen, Mansfield Park
But I agree that it still sounds odd in some circumstances.