We'll have single pilot airline operations sometime after we get single engine airliners for the very same reason, if you need to have one to get safely back on the ground then you're going to need at least 2 for dispatch.
I think HPSOV L is correct, if the Triple had systems like the Airbus that (a) wake up the throttles no matter what (Alpha Floor) and (b) had a warning that you're on your own with the thrust (like when you pull the throttles to idle on the bus Autothrust disconnects accompanied by a "ding" and an ECAM warning) this accident probably would not have happened.
Boeings most likely will be modified accordingly.