Augmentation state
Major air-transport FMSs and AFDS typically use whatever radio, GPS, inertial, and air data sensors are available, usually with either Kalman or second order complementary filtering. None have used SBAS since the advent of SBAS, as being completely unnecessary, and just contributing to excessive cost and complexity, as well as introducing new failure modes.
However for a few recent MMRs (poorly designed by avionics vendors so as to be able sell to multiple GA customers, with common components, and to politically cater to Europe's EGNOS) unnecessarily have incorporated some SBAS capability into their units. However that capability is still unnecessary and is largely unused, even if it is in the MMR or GPSSU. For the future, MMRs will increasingly incorporate "filtered" multi-constellation GNSS capability, often also including inertial filtering, for better accuracy, integrity, and availability (e.g., to minimize ANP/EPE growth). Note that inertial capability doesn't just mean expensive IRUs or ADIRUs. Inertial can be VERY LOW COST (e.g., even accelerometers or rate gyros), such as even now used in tiny low cost UAVs and model aircraft.
As for AFDS and autoflight..., modern air-transport systems typically can accommodate ILS inputs, or radio aid (e.g., VOR) inputs, and in particular FMS LNAV and VNAV (or equivalent) inputs. All modern air transport current production jets already have or have planned capability to accommodate GLS (which is GBAS).
The comment that GLS is only applicable to Australia is completely wrong.
GLS is already being used in many more countries than even cited in the earlier posts in this thread. GLS is a terrific system, that is now being incorporated in all modern transport jets because it is vastly better than ILS, as well as significantly less expensive in the long run than ILS, and is needed for some very important reasons technically, to work in conjunction with RNP (RNP will become the global NAV standard for the next century, or longer, for all airspace users, from tiny UAVs to GA, to air transport, to military, to space access and recovery, and GLS [GBAS] will play a key role).
Hence GLS (GBAS) with RNP are the global standard for the future. This is not just an Australia issue.
Instead, it is SBAS that is now an unnecessary obsolete complete waste of money (i.e., both WAAS and EGNOS), whose days are numbered, just like the once widely touted IFR Loran C and MLS. Just ask any air transport pilot flying into places like NZQN, or PAJN, or CYLW, or ZULS, if they'd now give up RNP. Or ask any pilot that's done a well over 25 kts direct gusting crosswind A/L on a 100' wide runway, with an engine shutdown in a wide body, while nailing the centerline within about 3ft laterally (yes it can now be routinely done, and it is truly amazing to watch).