My buddy flies drones in the Air Force. He says the general public has no idea how many we lose every month because of the poor infrastructure, and they don’t have plans to improve it soon. It would take years and billions of dollars to build an infrastructure capable of reliably piloting unmanned airliners and nobody will be willing to commit the resources to it.
The certification for Part 25 airplanes today is years in length. To add extra redundancies and ensure the flying public these planes couldn’t be hacked and flown into an elementary school would be an undertaking the manufacturers likely wouldn’t commit to. In the long run, it’s much cheaper to have a couple schleps in the front seat to handle the flying.