I have a fail safe installed in my car, along with a throttle return spring. The former for radio hits and the latter in case I just plain run out of battery. I will not run my car without them for either will prevent a runaway, though it might create an obstacle on track.

However, in my plane, I haven't come up with a good all round failsafe position that I feel comfortable with. Setting for idle seems to be fairly popular, but what if the plane is flying towards a crowd or property? Maybe the throttle will cut out in time, maybe it won't and actually land the plane in an area one wants to miss. I've heard of others that set up for a level, circle pattern, which initially struck me as a good idea at first but then realized that the wind could take the aircraft anywhere, and doesn't work if you are inverted.

I guess my question would be, if the AMA mandated failsafes, and it actually contributed to irreplacible damage, what would be the repercussions?