ED already has all the auto pilot it needs, its built into the actual flight model when in super cruise.
People are calling out Frontier as a game that had a full autopilot in it, well thats partially true, all it did was rotate your ship so that its facing toward the destination, then control the throttle so that you speed up /slow down.
Go back and try to play Frontier without the autopilot, it was very difficult to not overshoot your target / crash into it. It was absolutely required for gameplay.
It also didnt steer you round things like moons/ stars/ other planets if they so happened to get in the way, it just rotated you to be headed toward the target.
I know lots of 8bit Elite players that were put off Frontier because of the NEED to use auto pilot for all but the simplest of things.
Elite Dangerous tackles autopilot in a much better way to make it blend into gameplay removing the jagged edges people didnt like, put your throttle in the 'blue zone', and leave it there, it will speed you up and slow you down as needed.
So yes, you dont switch it on/off, and it dosnt make flying the just pressing a button by rotating your ship for you, but EDs design has actually already quite nicely given us autopilot (at least for the all important throttle control)