I can't see why a Battery car could not have the worn out parts replaced,
and a battery car would have massive savings over it's life in fuel savings and the cost of servicing, So a big one off cost after 10years would not be bad, and would be offset to a degree by trading in the old battery for recycling.
The Average life of a car in Australia less than 10 years any way,
I can assure you that, at least it was a couple of years ago, the average life of a car is about double that in Australia. The average
age of a car on the roads is somewhere near 10 years, half of them older and half of them younger. Hence why it took 20 years from the phase out of leaded petrol for new cars to it and substitutes disappearing at the pump.
As for repairs, you certainly could repair one but it comes down to economics. Consider that my own (standard petrol engine) car is 11.5 years old. It's mechanically A1 (only 78,000 km), as new interior but has a few minor scratches on the outside. Now here's the brutal reality - if I am involved in anything more than a truly trivial accident then the insurer will simply write it off as uneconomic to repair. It could easily last another 20 years with my usage, but it's not worth repairing if it needs anything major done to it.
For an electric car I'd expect the situation to be no better and quite likely worse. Without the need for regular servicing, parts will simply be built and the car designed without servicing in mind. Even a simple job will end up needing more labour than it would be worth paying for, and I'm guessing that the cost of replacing the batteries will be more than the car is worth in running condition - once the batteries die it's effectively a write off.
Cars in general are already well down this track. I remember quite well as a child that there were an awful lot of garages etc around back in those days. But what happens now? It gets taken to the dealer or some chain store mechanic for a service and that's about it. Excluding performance cars, modifications etc there wouldn't be too many people actually rebuilding engines these days - when the motor in a standard car dies these days it's usually the end of the car unless it's a warranty claim.
My neighbour had a Hyundai with about 220,000 km on it. It was a 98 model in fairly good condition. The engine needed some work and the end result is the car ended up at the wreckers since repair just didn't make financial sense. Give it a few years and the same will be true of any Holden, Ford etc too unless we're talking about an up market model with a good resale value when it's old.
My comment about not fixing electric cars isn't about electric cars per se. Rather, it's that cars in general are slowly going down the same track as everything else and becoming "disposable". The moment my 11.5 year old car needs more than about one sixth of its original purchase price spent on it, that's effectively the end of it unless I choose to burn money. Sad but true.
Another example along the same lines is the humble household hot water system. With proper maintenance, they have a life of 20+ years. But it's not worth paying someone to do the work, hence apart from a few DIY'ers nobody bothers and instead they just buy an entire new system every 10 years or so. Another thing that is simply "throw away" for no reason other than that the cost of labour to maintain it exceeds replacement value. Cars are about the only consumer item that hasn't already gone this way but even they are slowly but surely...