Would a drone pilot have emergency landed on the hudson and saved hundreds of lives k-s-u?
In serious answer to your question, it's unlikely that a drone pilot could or would have taken over control in such a situation at low altitude right after takeoff. Simply not enough time.
The drone tech could have avoided disasters at higher altitude and longer flight time, such as the Germanwings and Air Egypt and Malaysia Airlines suicides, the 9/11 hijackings, and the Air France and Air Asia (likely) weather related pilot errors. But that's still a lot of crashes that could have been avoided and about 4k lives saved?
Our drone techs are going to be saving german, egyptian, and malaysian planes too? maybe clams was on to something with the moon satellite.
We already have cross-carrier data interfaces set up by the plane manufacturers (pretty much just Boeing and Airbus for big commercial jets), not to mention manufacturers of some of the jet components (Mercedes Benz, etc.)
So cooperation among carriers doesn't seem like the difficult part at all. The hardest part would be setting up a system that could respond quickly enough.