Hmmm - a sort of mechanical overspeed detector/LP cock thingy might seem appropriate? Is there really a 'one shot' battery (thermal battery, presumably?) to cope with such failures. 'Compensating errors', I believe is the phrase?
I drive a car whose supercharger, fuel control unit, transmission and virtually everything else are controlled by software.
I can't even kill the ignition in 'D' - so I really, really hope that M-B's software is a bit more reliable than some. 354 bhp when you're not expecting it would seem a very bad idea!
But when you do want it......oooh yes!
OK, OK - yes, I know it has light red seats. Which are emphatically NOT pink!