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Costs would at least be lower, which at least opens the possibility of it becoming cheaper. Sure, it's possible to conceive of a dystopic scenario where GooUber has such a monopoly that they can just keep prices arbitrarily high and disconnected from costs, but I think that's pretty unlikely.

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It seems hard to say for sure that costs will be lower. The cost of a fully-autonomous/self-driving car is still unknown. Even if google is currently at the 90%, it's well-known that the last 10% is always the hardest. That last bit is especially important when you consider the consequences of imperfection in this venue.

He might be implying that the cost to rent a car, for 30 minutes, twice a day, would be cheaper than owning an, idle, car 24 hours a day.

Or, sharing the ride with three other commuters could bring the total cost of ownership to ~15 minutes per day.

I meant that the incremental cost of paying a human driver would be gone. The fixed cost of inventing and developing the self-driving technology would be minimal because it is amortized across all self-driving cars.

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