Not_a_boffin,
You appear to be justifying an open ended contract which will cost us more to get out than cancel, for a product unsuited to the present economic and military needs by pointing to the Typhoon.
The Typhoon contract which has been lambasted for many years for tying us into a situation where it will cost us more to cancel than to buy aircraft which we no longer need.
Personally I would have said the moral was perfectly clear and we should have learnt from it.