Considering most PAPI at A380 capable airports now is vastly different to the glideslope the (Australian) T-VASIS looks like a much better alternative. That is all aircraft following a PAPI will theoretically touch down at different points depending on eye position, threshold crossing height will vary depending on type. With a T-VASIS you can use dots up or down to fly a constant flight path angle for the same touch down point or TCH. For example a 737 may fly no light deviation for a TCH of 50ft and the A380 would fly 2 lights high and achieve the same approach angle and same TCH. But having a visual approach system that is compatible with the ILS system is just silly isn't it, its better to just make pilots destabilise their approach at 200 ft or less to change flight path to suit the PAPI.