In the end it is still RNP that's needed globally
All said and done, ...since at least AL371, AL736, AL737 and before, and through the period of TWA 514 and since, ....it is [real] RNP that is actually needed, to every jet runway. And since the 1990's, GLS/GBAS, which is vastly better than ILS, and significantly less expensive than ILS.