J Bloke,
History has shown we adopt a Cortezian approach to the new world and burn all our boats when we land ashore. JPA will have to work because a very senior bloke will have said so. I would expect it will improve to some degree and then we will just have to live with the fixes we can't afford. You may need to adjust your practices to accommodate the computer's shortfalls, but in statistical and RAF News terms it will be a roaring success and another knighthood tick.
Slightly further down the food chain I'm sure a few career-minded 'yes men' will gulp a few more times yet and glance at the burning hulks of SAMA and the other working vessels sunk before her...