Sully's ditching however will result in landing at TEB with no drama apart from pax wet pants be it a fully automated aircraft and after heavy landing inspection and engines change aircraft will be flying in 2-3 days.
That is assuming that the stricken aircraft had an abort routine with a non-standard heavy landing in an emergency mode coupled with an appropriately pre-recorded "Mayday! Get out of my way" message, all local METARs, an automatic 7700 squawk with an optimal quick'n'dirty "glide to the nearest threshold, disregard the weather and performance if it's just slightly out and weave around the traffic" 2.1 upgrade pack then it's entirely feasible.
But how many versions of software will it take to get there? More than one is un-acceptable. So only when software arrives as a final version, bug free, with every possible eventuality coded will this "game-changer" be acceptable for use on public transport aircraft.