Would it not be wise advice to first physically disable the aircraft and THEN leave.....?
Before 911 who would have thought it possible that hijackers could take control, navigate and deliver the aircraft at low level with pinpoint accuracy...? Some CAN fly therefore and it would not be beyond the realms of possibilty in this flight sim age to get the thing rolling and off the ground.....
These particular hijackers don't sound in the same league as the 911 guys, but i think a bit of deliberate disabling of the aircraft (ie fire handles pulled) would be in order before abandoning ship.....Hope that is standard hijack training before getting out.....
And don't get me wrong getting out IS the thing to do in my opinion if at all possible whether you are FD, CC or PAX.....