There is a simply feature that could prevent the stall: Alpha Floor protection (like in the Airbusses and the Fokkers).
But also that didn't prevent some idiots from crashing in Perpignan... - at least there were no passengers involved.
But hey, you have speed tolerances, depending on company, +5, -0kts. If you as PM you see that the PF is off the tolerance, you are shouting "Speed!"
Dani