it seems likely Galileo will have similar availability and integrity, using the same concept as the military P-channel on GPS. It'll be a game changer I think, although not so much perhaps for the airlines locked into using ancient FMS equipment.
I am not convinced.
Galileo is certainly capable, but I don't see any current TSO c145/146 GPS manufacturers jumping on it.
It's optimistically called "GNSS" instead of GPS to make it sound generic, but I am skeptical it will work that way in practice.
I see a lot of obstacles before a Galileo (or hybrid Galileo/GPS/GLONAS) unit is the considered the equal of a c145 GPS by CASA.
Be nice to see it this side of 2025, but I doubt it...