When they talk about switching of navigation beacons I get very uneasy. Satellite navigation systems are a great convenience, but I wouldn't want to climb onto an aircraft where it was the only means of navigation, even if there were multiple redundant systems.
I spent a short while working on a Canadian oil tanker in the 1990s, and remember seeing the cadets going out onto the roof of the bridge with sextants, stellar navigation being a compulsory subject. And while there was a GPS system on the bridge which was used, the captain had charts of the area through which he was navigating out on the bridge as well.
I guess my concern isn't that the satellite navigation systems will fail, but that there will always be more to the art of navigation than a satellite based system can offer.