Are cabin crew not needed? Try departing a full 747 without any cabin crew onboard and you will see what happens. I gather you would get a personal visit from CAA.
If it were not for the sales folk, rev man, finance, schedules, ops cntrol etc.. all those people you seem to despise, you wouldn't have a destination, a slot, a 747 or any passengers in the first place ! You could, however have all the former and then wet lease a plane (as BA did during the strikes) - so having your own cabin crew , plane and (whispered softly)
flight crew are not essential.