And my point is that action by a number of other groups in the airline would also cause the IMMEDIATE GROUNDING of the airline.
Take Cabin Crew for example. What's the legal implications of trying to fly a 747 from LHR to HKG with flight deck crew only? Are you going to fight your way out of the flight deck, down the stairs, all the way back to Door 5R to help with an evac. in an emergency? Didn't think so.
Seems you have forgotten the safety aspect of Cabin Crew which is far, far more important than their role as meal server.
Take engineering for example. Why is it that when I come as SLF to BAH on a BA 777, invariably the cover of the GE90 pops open and there are people looking at the engine? Surely not, if maint. only happens every couple of weeks. What about the BA Engineer that flys BAH-DOH-BAH every day. Does he do this for the good of his health?
And don't give me that 'anyone could do it' bollocks - you're not the only one that has to be legally certified in an airline operation.