Sensor problems can be solved by having more sensors. It's not like humans have magical ever-working senses.
How did the pilots know the system was incorrect in its assessment that the aircraft was stalling? Chances are there is some kind of electronic sensor that could provide the same information to the system.
Uh, you're wrong - in the case of trained pilots, humans do have magical ever-working senses, it's called a thinking brain. More sensors that give wrong information to computers only makes the problem worse. The human ability to critically think and make decisions based on experience and "doubt" are fundamental to safely dealing with a mechanical issue.
While the pilots in the Air France plane crashed off the coast of Brazil because they trusted the instruments - the way a computer would behave, which you think is so trustworthy - there were other pilots who dealt with the same wrong sensory input and determined that the best course of action was to maintain flight principles...and not stall.
To trust in sensors and electronics in the way you describe would get a lot more people killed. I dislike this prospect very much.
As far as I remember from my anatomy classes, the brain is not a sense. Experience and doubt can be programmed - that's why we have classes and training for pilots, which is the equivalent for humans.
they trusted the instruments - the way a computer would behave
Computers behave however we make them behave. They certainly don't need to trust the instruments if we program them not to.
And that interpretation of the Air France Flight 447 is dubious to me. The instruments told the pilots what was happening (the stalling alarm sounded for almost a full minute) and they apparently ignored it, because they didn't understood how it worked - that it would stop sounding when airspeed was low enough -, not because it was faulty.
> the pilots in the Air France plane crashed off the coast of Brazil because they trusted the instruments
As far as I know, this crash was caused by erroneous human intervention. An (inexperienced) co-pilot was hanging on the flight joystick near constantly, unseen by the others on the flight-deck
How did the pilots know the system was incorrect in its assessment that the aircraft was stalling? Chances are there is some kind of electronic sensor that could provide the same information to the system.