Is 60 kt really too low cut-out for widebody?
It would seem not slow enough.
All the ADCs need to know is whether all the airspeeds are within a certin limit of each other. They were not, and the system alarmed/downgraded as it was supposed to.
Where the problem arose was in the fact that the crew were overwhelmed by the automation, instead of asking why the airspeed was indicating 60 kts and the stall warning intermittent.
Regardless of any computers, I hope people haven't already forgotten that the by now very low airspeed was showing as such on the PFD and ISIS?
Regardless of what people fly - SIT and THINK when an alert first appears. Do a sanity check - are basic flight parameters nominal for the phase of flight?