Obviously I cannot predict what the Australian government may do, but looking at the matter generally...
Your first sentence suggests encouragement rather than compulsion, and we know you do not like electric cars and apparently not solar power either. (I am cautiously neutral about the cars but could never own one).
I think though in time, there will be no choice, as car manufacturers stop making ones with internal-combustion engines; and as Diesel oil and petrol become scarcer and costlier. You and I might not see that even if our three-score-and-ten is granted generous overtime; but our children or grandchildren might. That stop is by broad governmental policy.
A party in a democratic, multi-party nation might be very wary of enforcing all that you suggest, but it is even universally possible practically and financiallyl? No, although many EV enthusiasts cannot comprehend that, nor why.
I don't know if this is paralled in Australia, outside of town centres anyway, but there are three main reasons Britons do not have electric cars, apart from mere taste or prejudice:
- The purchase cost although that is reducing (relatively), and so far at least, poor trade-in value;
- Choice: most motorists neither need nor want, so do not buy, anything more than a plain 4-5 seat saloon-car; but so far there are few electric estate-cars and vans / caravanettes, or EVs fitted for towing any sort of trailer or caravan.
- Many motorists genuinely can not charge one at home, nor use private solar power.
(I can't own one for all three reasons!)
So I do not think it would need compulsion at private level; rather a slow death of the i.c.-engine by policy and dwindling resources. Unless, of course, some genuinely sustainable, alternative fuel becomes available for private cars. So far, "bio-diesel" and hydrogen are largely restricted to heavy goods vehicles, agricultural / earth-moving plant and railway use; and still experimentally for the latter two classes.
I do predict far fewer private cars in future for those reasons. Anecdotally, there are now many urban dwellers choosing not to own a car because they do not need one for their own situations; and it would be very uneconomical for them.
The future may even reprise the era of the first battery-electric cars and light commercial vehicles, when you had to be rich to afford any sort of car, whether you were in some imagined "elite" or just highly-paid.
That was over a hundred years ago...
