Sure, they would have decomposed, but you'd still have the remains everywhere. It would surely be too monumental a task to recover and bury or burn them all, but the survivors would have had to dispose of many bodies in places that they'd reinhabit or rebuild. It would be a gradual and progressive process but in the long run the remains would have to be disposed of. They wouldn't be a health hazard but you couldn't leave dessicated bodies lying around in every house or other common or needed areas or facilities.
Restarting civilization with a handful of people (maybe 1000 or so at most), even in a small country like Australia, would be a huge and lengthy task. Recovering old equipment, cleaning up 20 years' worth of exposure to the elements without maintenance or repair, getting electricity back, restarting agriculture (including breeding animals) and the rest would be enormously difficult. Not to mention there'd be little gasoline (petrol) available with which to operate heavy machinery, a critical component both to rebuild and to extract the brown coal burned for electricity.
Hopefully there might be a few other nuclei of humanity who survived elsewhere and eventually they might all make radio contact. But international travel would be many years off, and all parts of the Southern Hemisphere would suffer the same shortages, mainly oil, that would inhibit recovery. Remember also that the land masses of the Northern Hemisphere would continue to be uninhabitable for many centuries, meaning they couldn't even venture north to obtain oil and other raw materials. It would be a hard and limited life...but at least it would be life. And after a millennium or two, the world might again be reasonably populated and thriving, albeit in a more reduced and straightened way...though the wreckage of the past would still remain, and would for thousands more years, though it'd all be in a sparsely populated North.
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