I think many bad things of Air France's FA when it comes to their work attitude.

However, one thing I am sure of - and this is where I still have lots of respect for Air France staff - is that the scenario you describe will NEVER happen. They upgrade their buddies, they help themselves to stuff from the onboard duty free, they go on strike for ridiculous reasons, etc - but they do all of that perfectly groomed, curtious, with style and class. ^

So if you want to make a blatant example of where things might lead to you could think up a scenario where there is a note at the curtain of the Première cabin which says "Employees only" (thinking of it, we sort of have that situation already, bar the note on the curtain), or situations where AF employees and their buddies get the confirmed seats and pax get bumped (thinking of it, we sort of have that situation already when AF staff + friends travel on one of the Rx tickets)... so maybe I just can't think of things to be worse?