Some things are hard, if you're moving to fully automated flying, you'll might just end up shifting the "training issue" to the hardware and software engineers, while removing the factor of "human intervention" in case of a fatal failure, and these happen: http://www.flightglobal.com/news/articles/sensor-icing-caugh...

There was a similar issue in November of last year on flight to Barcelona, luckily, the pilots managed to restart the systems just before 150 people would have died.