ILS has well documented vulnerability and failure modes (e.g, interference, beam bends, multiple glide paths, over flight disturbances, flight inspection use restrictions for both LOC and GS, tidal effects on GS formation, snow effects on beam shape and angle) dating back to the 1930s, ...which is why we still have ILS critical area protection provisions in places like Annex 10, the AIM, and Order 7110.65, ....and why ILS is often NOTAMed OTS just when you need it the most, during snowstorms. As to the LFPG event, GLS can provide a glideslope without fear of encountering multiple GS angles, for safe and efficient RNP capture from either above or below the FAS path. As for RVR 75m, GLS performance and integrity are far better right now that when we did the original Cat III approvals based on ILS back in the early '70s. GLS is entirely capable of supporting fail-op Cat III with RVR advisory, for any TD, mid, or rollout RVR reported. The future is RNP and GLS. It is time to recognize that due to both inherent weaknesses, and high costs, ILSs days are numbered.