Indeed they will, ETOPS, GPS is the way to go.
Now, not for just large international airports, which are aptly served by ILS, but the more remore airfields, that have now possibly and NDB or VOR approach...but sure could use a precission approach that GPS/LNAV/VNAV will provide.
Far too many folks forget about these less served destinations, where GPS will provide enhanced aircraft/crew/pax safety.
I find it strange indeed that those in Europe/UK still have their collective heads in the sand.
However, I suspect the Brits may be the first to cave, especially as they were the first with......RADAR, automatic approach/landings (hello, Trident...a superb achievement) etc, and put 'em to good commercial use, while the rest of Europe couldn't care less.