Do you have any idea how much the airlines should be spending on training for a 30 year old system?
Older subsystems can provide good results. With proper operation and operated taking into account and respecting itīs limitations.
The Economic downturns affecting air transport perhaps played a role.
IMO much more serious is the "Pitotīs" issue. For new and critically dependent machines.
The new concept of Laser principle AS sensors
(some patents filed by EADS) shows we will be during some time still vulnerable.
So is crucial respect the limitations. (obviously including here the ones of "FBW"
highly optmized airliners)