First of all we have to look at what's happening in Ukraine and the learnings that are coming out of there. One thing is absolutely obvious and that is despite all the technology, you still need the individual infantryman with their rifle, bayonet and boots to both take and hold possession of any piece of dirt. No fancy UAV, UGV, or vehicle is going to do that. Tanks and other armoured cannot operate without infantry support. The Russo - Ukrainian War experience has reinforced that lesson harshly, in the case of the Russians. So just based on that I disagree with your assertion that the conscription of massive amounts of infantry is a thing of the past.
I do strongly agree that the CoA has to have a comprehensive plan in place for when it has to mobilise Australia on to a war footing both WRT the economy and allocation of personnel. During WW2 NZ had the 2nd NZ Armoured Division in North Africa and later Italy and as well as a large contingent of men with both the RAF and RN. When the Japanese entered the war the 3rd NZ Division was raised and went into action IIRC 1944 in the Solomon Islands and PNG offshore islands against the Japanese. However it had to be recalled back to NZ because of the manpower shortage here to undertake agricultural work, industry etc. NZ was also responsible for supplying rations, grenades, repaired vehicles etc., to the US Army in the South Pacific.
Considering that modern platforms, weapons etc., are far more technically complex than those 80 years ago serious thought must be given to ensuring that the ADF has the required national technical and logistical mass behind it in Australia. If it doesn't it and Australia will be in serious trouble, and could end up having to field these.
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Cappy's Modular Musket. Task & Purpose.