I sense that not every reader of these dispatches has been persuaded by my arguments that singular they as the solution to English's epicene-pronoun problem is not only reasonable, but increasingly accepted.
So I took the trouble to look for a little evidence. Not a thoroughgoing scholarly investigation, but half an hour's rummaging around a single pattern in a single source, the Corpus of Contemporary American English. I passed over the entries for the numerous spoken sources and most of the fictional ones, looking to see whether singular they crops up regularly in mainstream publications.
And behold:
Associated Press, 2001: Perhaps not everyone will have all the steak they want, but most experts - even those who have doubts about genetic engineering - agree that enough food can be produced for the whole world in the 21st century.
Virginia Quarterly Review, 2003: Everyone undoubtedly wore sandals and bound their hair with wooden sticks and leather thongs.
Southern Review, 2005: It's like the suits give everyone a chance to try on their secret hidden identities.
Christian Science Monitor, 2007: He says their example shows those inmates who are single how to become caregivers, and that everyone is motivated to be on their best behavior.
Saturday Evening Post, 2007: Her list of heroes includes the aforementioned Dr. Laura and Judge Judy, a woman with the legal right to tell everyone else what's wrong with their lives.
U.S. Catholic, 2007: Finally everyone has the right to choose their own state of life, a right to their good reputation, and to privacy.
San Francisco Chronicle, 2007: Patients with active HIV and veterans get medicine at cost, and everyone else foots the bill with their purchases.
Christian Science Monitor, 2008: Everyone else can stand up on their pedals for leverage.
Washington Post, 2008: This seminar leader was telling everyone that the Internet could be their friend.
National Parks, 2011: Civil War history is so wide and long and deep that it has the potential to engage everyone, regardless of how long their family has been in this country, or what their connection is to the battles or those outcomes-because we're all affected by the outcomes of the war.
Denver Post, 2012: Like snowflakes, they arrive, everyone different, yet similar in their message.
If you like, I can go on.