There is a piece of technology that would have prevented this crash happening, but it was turned off. It wasn't broken, it was turned off with no contingency being put in place, because it would have been more expensive to put that contingency in place.
The ILS GS equipment was not simply "turned off" in some arbitrary and capricious cost saving act. It was Out of Service whilst being relocated to properly give accurate guidance to a newly displaced threshhold. Airports do not have spare antenna arrays lying around for this type of situation. They NOTAM the GS being O/S, and aircrews, during their pre-flight planning, prepare themselves for a visual approach if the forecast is CAVOK. If you are making a 10 hour flight to an airdrome with an O/S G/S, that means you have more than 10 hours to mentally prepare yourself for that visual approach - if your pre-flight planning was thorough. That is the standard "contingency".
Have you ever set up or moved a precision approach navaid system? Do you have a clue as to what is involved? They are not iPads on casters that you merrily move about as you see fit. There is a reason they are called "precision", and haphazard or rushed installation or movement defeats that "precision".