The planes are specc'd by guys whose whole life is about flying FJ's - if you say some spotty faced recruit sitting in a portakabin is going to replace them it strikes at their whole life and value system
You don't ask a barber if you need a haircut and you don't ask pilots if they want unmanned aircraft...........
(and just look elsewhere on PPrune to see the reaction of commercial pilots to the idea of one -man - or unmanned commercial 'planes................... )