content: You can land without thrust at all (see the Gimli glider or the Hudson incident - but there has been a few other incidents like this) - if you end up with the flight surfaces badly enough damaged to prevent flight and/or any other catastrophic failure,  I doubt this system would do you much good. I'd rather see the airlines invest the kind of cash that would be required to implement this gadget into additional pilot training - which would have prevented the embarrassingly bad incident like the Asiana Airline mishaps or that AirFrance incident from occurring.  If we really want to add gadgets, I'd vote for anti-missile counter measures before this unproven technology,  but hey,  it's just me.