Free flight was supposed to have happened already. But there are obstacles.
As for ATCs if you do not make use of a skill frequently, you atrophy. When you are suddenly thrown in the middle of an emergency, you perform badly. We can't have "mall cops" watching computers doing air traffic control.
People do not like automation that much either. Consider the fact that underground trains have drivers even though technically they are not needed.
And then there are the technical aspects...
So I do not think that this particular crash would bring much new to the table.
We have driverless trains without drivers at all. There is some staff getting into random trains to check for problems (like problematic passengers, etc).
Interesting thing: the migration is going gradually, there are trains with drivers running on the same line than driverless trains, and IIRC this was never done before.