I think you're imagining that current airliners and current flight instruction work very differently than they actually do. A very large fraction of flight instruction is carried out in planes that predate the embedded-computers era, starting in roughly 01975, and the more recent planes that carry most commercial air traffic are designed to simulate those computer-free planes as closely as possible.

Yeah, maybe there would be a huge spike in aviation risk, so instead of one flight in ten million crashing, one flight in a hundred thousand would crash, but that's still not enough for aviation to become a dominant cause of death for weekly business air commuters. People would freak out when they watched the news but only in countries that hand over the reins of society to nervous nellies would it be a real obstacle to aviation.