Before we get too excited about self-flying planes, watch the following video, which is the NTSB's animation of US Airways 1549 landing in the Hudson River after having both engines knocked out by geese:
https://www.youtube.com/watch?v=5S5hRRio-E8
If this happened to a self-flying plane, would someone on the ground be able to remotely take the controls in a matter of seconds and land it safely (or at least avoid crashing it into a densely populated area)?