Ten years ago, we weren't relying on GPS to the same extent.It’s not been an issue for the past 20 odd years, but I suppose that’s no guarantee of future reliability. I imagine the greatest threat would come during the time of driverless cars. If they were reliant on GPS and a licensing fee was changed, that could cause big problems. The GPS operators could effectively hold a nation to ransom.
Things like lane navigation, location of utilities (underground services being an obvious example), etc., really do need high accuracy. Either by improvements to the satellite system or augmentation by other approaches.
Yes, someone else being in control is not acceptable. But even if we had our own entire system, it might be a really good idea to be friends with Galileo so that we provide resilience to each other.