I have a somewhat different take on how viable long-ranged attacks upon hostile, or potentially hostile airbases are. Given the pace and ferocity modern warfare can achieve between advanced, peer-level armed forces, even temporary reductions in capacity or performance from an airbase at a strategic location in the opening stages of hostilities could have a significant impact on the outcome of a campaign.
Passive measures can make it more difficult, or require a larger strike package to achieve the desired impact, but in and of themselves are IMO insufficient to stop a strike from being successful, particularly if the objective is to reduce or destroy a static emplacement of strategic value. Also, if the attackers have been paying attention, then several of the passive defensive measures will be of at least significantly reduced effective, if not rendered ineffective outright. For instance, it would be rather difficult for an airbase to disperse and/or camoflauge fixed infrastructure like fuel storage tanks, unless these efforts were designed into the storage tanks at the time of their construction. Any damage to or loss of the fuel tanks would immediately reduce both the amount of fuel available at the base to refuel aircraft, vehicles, ships, etc. but also the amount of fuel the base is able to store. Or alternatively, the fuel tanks themselves could remain intact and with minimal damage but the systems used to distribute the fuel from the tanks could be damaged or destroyed, rendering the tanks and stored fuel largely irrelevant. A RAAF base would have a difficult time sustaining operations with minimal usable/accessible fuel stocks, particularly if the base was trying to support larger aircraft that would be operating at range (E-7, P-8, C-17, etc.) and/or the base was one of the more remote one, some distance from most Australian ports and fuel infrastructure. The situation holds true for Army and RAN bases as well, though IMO the situation would be more serious for a RAN base than Army.
There are of course other fixed installations located at a hypothetical base aside from just fuel facilities that could be struck as well, but I just used fuel infrastructure as an example.