On re-reading some of David Weber's fiction I recently noticed a nice touch in how he writes dialogue.
When a Weber character uses a dummy pronoun, the gender will be that of the speaker rather than the (perhaps) more grammatically correct masculine pronoun.
It means that a dummy pronoun reflects on the speaker (a known quantity) rather than making dangerous, often discriminatory, assumptions about the gender of the target.
I like this approach and think that it is far more likely to catch on than kludges like "he/she".
The latter works well enough* in written text but it is awkward at best verbally. *To an extent, the addition of 4 characters in a Twitter posting would never fly.