It seems likely that, in the not-too-distant future, we will all be eagerly recording everything around us to prevent these kinds of injustices from happening. Imagine if you'd had a mic running, then played it back to the captain. Problem solved - and the FA would have gotten into trouble for creating a liability risk for the airline.
It's more likely that you would not be allowed on the plane with anything that appears to be recording.
I can buy simple digital video recorders embedded in pens, watches, bluetooth earphones, baseball caps, ties, crucifixes and more from just a casual search of Amazon, for example, and that's hardly the state of the art in covert recording.
The more obnoxious anti-photographing policies people experience, the more attractive it will be to make recording devices less obtrusive.