what if autopilot had option to press some button every 5 or 10 minutes to check if pilot is conscious, if not it would automatically descend to FL100 or even FL50? Maybe it could save the day.
It's not quite that easy. The system would need to be linked to some sort of terrain database. Remember, in some parts of the US (and other parts of the world) 5,000 feet, and even 10,000 feet, willl put the plane underground.