This is a technology that should never be allowed to fade away. One day...or maybe night, there will be a solar flare that destroys all the satellites within a line of sight. We need that back up science, especially now that it can be contained in a small device.
I used to feel more confident about inputting an update slap-bang over a VOR, cos the vibration and basic acceleration during take-off made me wonder if the system would be affected.