I don't think the US Coastguard turned off the DGPS system when SA was turned off, see
IGPS FAQ I understand that DGPS in practice will provide 3m accuracy near the station, reducing by 1m every 100 miles, but the headline figure is still 10m.
EGNOS is the same as WAAS, so Europeans have in theory Cat I approach ability using the US system, but apparently don't want to use it in aviation. I share the cynicism about European use of GPS in aviation, it reminds me of mobile phone use on planes. The authorities banned it on spurious safety grounds until somebody worked out how to make money from it, and now it seems OK!