I agree as to the intention, HWD. But a) the method and b) the timescales.
Now I am 50. Most private IFR pilots are not spring chickens either. How old will I be before they will dismantle ILS approaches throughout Europe?
Remember they will have to force every airline that flies in/into Europe to install the new kit. Since all these airlines will already carry ILS etc receivers, the EU will have to dismantle ILS approaches to force Galileo usage.
I can't see how this could be achieved, for decades.
GPS approaches will be nice if they enable IAPs to appear at many of today's IAP-less (and tower-less) GA airfields. Otherwise, they are largely irrelevant because anybody can fly the corresponding overlay in his GPS receiver, right now.
GA will never be a significant Galileo earner (far too small) so I don't see the CAA introducing GPS IAPs now and then pulling them (for fund raising, basically ) unless one has the Galileo subscription.
ILS is the gold standard for Cat1,2,3,3c,whatever and will remain so for decades to come.
Technically GPS is superior in just a few locations around the world, where one could have a curved approach flown coupled with both lateral and vertical guidance.
EGNOS is relevant only to a "virtual glideslope" on a GPS approach. A Garmin 496 (etc) receives EGNOS now (mine does) but it doesn't make any difference enroute.