Sunfish,
can't see it happening mate. Airports already have systems in place that suit their local risk context and that are approved by the department.
Introducing something that will incur expense just because it is convenient for pilots I cannot imagine being too high on their agenda
Traffic,
well done. A point far too many individuals don't get at all. The airport decides who and under what circumstances a person can go airside. An ASIC just means they can, if they choose, allow you unescorted access.
Had one smart alec once try it on at a screened port with the comment "tell the ground staff that as I have an ASIC I can go airside whenever I want". I don't remember if I was more amused or pissed off with the arrogance and stupidity.