An ASIC is not a valid for of ID
Maybe not for a 100 point check at the bank or post office but given its use in the past at check in, I'd comfortably make a pretty substantial bet that it will be accepted.
It will most likely be an airline or ground agent at the boarding gate doing the checks. To do it prior to screening would preclude all but travelling pax into sterile areas. Although that's how it's done in the US
I don't believe the Department pushed this agenda. They are on record as saying they are concerned with what goes onto an aircraft not who. This has long been a concern of AFP and state police.