Is there a simulation exercise to explore 'What if there was a complete situation failure'
AS one who has sat through more spacecraft launch/early orbit phase simulations than I can remember, may I point out that the anomalous scenario which actually happens is never the one you spent hours and hours rehearsing for.
Furthermore, having a back-up or simulation facility means synchronising it with the in-use facility so that both are running on identical hardware and software. Given human nature, this is extremely difficult, more so with the software than the hardware. Providing systems so that the backup facility is continuously updated from the in-use facility can trigger yet more problems.
Personally, given the Government dithering mentioned here and the lack of resources, I think NATS do an excellent job most of the time.