Use of the plural form also has the advantage of being the stylistic direction the language is trending to. English is a mass hallucination anyways, why stand in futile defiance of its whims?

The grammatical value of "they" used as a singular has been discussed frequently at the inestimable Language Log, including citations of the form used by such disreputable, notorious abusers of the noble English tongue as William Shakespeare and Winston Churchill. A good post on the subject, though by no means the only one, can be found here.

Maybe next time, we can all argue over splitting infinitives, ending sentences with prepositions, or other happy chestnuts of wholly-unfounded prescriptive grammar pedant absurdity.