Many years ago I worked for an airline in EU that did teach this to CC on CRM courses. Yes it is an unlikely senario but arn't they all? Till it happens!
I think the idea being to integrate the CC into the cockpit CRM a little more so this was a good start. I have to say after hearing one of the CC say, with a 20+ year career behind her, " I always wondered what those were for" I thought it certainly had a purpose. Disemination of information is always a good thing!