It seems like the situation was resolved in the best way possible. It is not that Galileo was harder to jam, but that jamming Galileo would also mean jamming their own GPS. So they settled on using different frequencies, which means you can jam one without jamming the other, and vice versa.

Also, possibly as a result of these negotiations, the US said they will stop using selective availability for GPS.

For me, that's the best solution for everyone, at least in times of peace. And in times of war, well, all bets are off anyways.