In my opinion the 'old' part of NAS is the ATC interface. New NODE displays with VSL and SFL (Mode S thingies in use at TC), electronic strippery etc and you will not even know that you are talking to NAS at all.
Like I said, NAS is older than SACTA but streets ahead in usability in very complex airspace, flexibility and upgradability.
Will heads roll over this cock up, rumoured to have cost £130M? I doubt it. Chances are that they will be "re-deployed" so that they can make the same expensive mess all over again, and that will be the third time for some of them!
