You need a valid ASIC if you require frequent access to a secure area of a security controlled airport that has Regular Public Transport (RPT) operations.
All the airports I go to that HAD the blue line now require an ASIC for access to any part of the tarmac. Mildura & Moorabbin are prime examples.
The really funny thing is that if you go to a primary airport, the ASIC isn't worth anything since you have to be escorted by a security person anyway.
So, its worthless for what it was intended and required where it wasn't intended.