ILS/RNP - good choices - GBAS/GLS+RNP a 1000 yr answer
I concur on your comment that ILS will appropriately be with us for a long time, and it provides good, albeit at times imperfect and typically expensive service. Also, particular current generation autoflight systems implementing RNP procedures can certainly benefit from some further evolution, simplification and enhancement. But overall, the combination of RNP with GBAS/GLS is likely to provide us with an extremely robust low cost and very safe family of globally available path solutions for navigation (not just for takeoff and landing), perhaps for centuries to come. It is time for operators and ANSPs, as well as authorities to now get on board. It is the future of navigation.