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I agree that the existing car stock will take a decade or two to age out, but I can't see any reason it takes 50 years to get to a majority autonomous fleet. Maintenance costs for cars in autonomous fleet will be significantly lower due to standardization and economies of scale, so non-autonomous cars will look relatively expensive in comparison (beyond being less convenient), causing them to be scrapped sooner than you'd otherwise expect.

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I agree, my original post did not imply this transition would happen quickly, I think transitioning to automated vehicles will rely more on society changing, so at least one generation from the youngest today... and as far as requiring people to get automated cars, if they're safe enough, it will be like outlawing drunk driving, ie you're infringing on others right to live if you don't use an autonomous vehicle. The corollary is that right now there should be laws strictly controlling the use of autonomous vehicles.

OK. I read your comment as saying that it would happen slowly, not quickly, which is what I was disagreeing with. Personally I think the economic advantages of routinely using a self-driving taxi service will drive most people to simply not buy a new car when their old one wears out, and that this will happen many years before human-driven cars are outlawed (or, more likely for a while, regulated/taxed very heavily without being completely illegal).

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