B52s?B47s
Having a force, Air-to-Air or Air-to-Ground, that relies soley on an individual aircraft type doesn't really sit well with me.
Although I know little of particular capabilities, I was always under the impression that the current Hornets can conduct some strike operations and, god forbid, the F-111s do actually have the capabilities to carry some short range Air-to-Air missiles (AIM-9 of some variety?), but no cannon nor anything with a longer range. At least we'd have something that could shoot down a Cessna 150 dropping grenades out the window, or more realistically attack an invading ship though if one of our aircraft types was grounded!
The RAAF talking/hiting of a progress of F-111+F/A-18A/B -> F/A-18A/B+F/A-18E/F -> F/A-18E/F+F35 force structures at least provides that sort of situation, up until the point when they suggest they'd like an entire F35 structure.
Even though it may amount to nothing, with the large number of F35s being delivered internationally, there is ultimately going to be a point in time where an incident will occur on an F35 somewhere that will cause the grounding of all F35s for some period of time, would there not?