I believe that if we don't give the current/future generation of aircrew a glass cockpit then they will feel cheated and underwhelmed. Put an old duffer in a glass-cockpit machine and watch them falter over the myriad of menus and button pushes - put a youngster in the same machine and its 'duck to water' time.
We have to move on with our fleets. We found that with Hawk T2 studes that although they were poorer at 'head down' work than their T1 peers, their ability to cope with Typhoon cockpits was much improved by the T2 studes than the T1 - there were of course exceptions, but they were the future 'exceptional' pilots.
LJ