The field demo I want to see, Human in the loop to failure switch over: Simulated failure of some form, where (for safety reasons) crew triggers ejection. This defaults the system to autonomous mode and the plane performs a safe landing.

Auto GCAS (Ground Collision Avoidance System) exists (pre-AI), although it is nowhere near as sophisticated as what you described. Similar type of idea though.

If the pilot passes out during high-g maneuvers, the aircraft will pull up and bring the wings level until the pilot regains consciousness.

https://www.lockheedmartin.com/en-us/products/autogcas.html

Autonomous landing systems do exist on the civilian side, and have been successfully used at least once.

Autoland saves King Air, everyone reported safe https://news.ycombinator.com/item?id=46346214