I have a suspicion that a genderless pronoun better than "they" will gradually emerge as so many people in these Internet days choose to bypass identifying themselves by gender. It won't be forced or decided by committee, however. It will be a new pronoun (or perhaps an existing pronoun) that simply catches on.
Then we can move on to deciding such pressing questions as should a normally non-capitalized user name be capitalized if it's the first word in a sentence.
