> pay for insurance, gas, tires, oil changes, parking, washing etc.
If you use a car you are paying for those costs. There is no getting around it. If you uber it is indirect, but part of your costs per ride is going to those things. Renting a car gets someone else to do them - but you are paying them to do that somehow. (self driving make trade parking for gas where parking is expensive, so in the densits areas this can make sense, but only because the car is driving empty out to the suburbs in the morning and empty back into the city in the evening - so it increases traffic)
If you own your car you can choose to not keep it clean. The rental will not allow that choice and so you pay for it.
It won't be much if any difference. Rush hour is when most people are trying to get around. Worse, they are all trying to get to the same place, so if you are thinking two trips downtown - that means there is an unoccupied trip back out to the suburbs every morning (and again in the evening) - perhaps more if we are also parking in the suburbs where parking is cheap (though this is probably offset by the cost of parking downtown)
This is better solved by leveraging more traditional forms of transportation. Making biking, walking, and various forms of transit easier, safer, and more effective. Cars, whether self-driving or not, are in direct opposition to this.
I'm sure they could be useful to folks that have the specific use-case for it, but the vast vast majority of trips in a person's day-to-day are better solved by robust multi-modal options and public transit. The benefit there is that less drivers means that traffic is actually better for everyone.
I actually see this as a benefit! Cars take up a lot of space and so now there exists massive right of ways that can be used and modified for other transit modes. Take a lane away from personal cars and dedicate it to buses so they can run faster and avoid traffic. Remove some street parking spots and create a protected bike lane or a street market or something else. The extra space can be a huge boon. It’s pavement, basically a blank canvas imo.
Fix those two and personal car ownership will plummet in many places.
Many people don’t want to own a car, pay for insurance, gas, tires, oil changes, parking, washing etc.
Car ownership sucks horribly for most people, it’s just currently the best option. That will change.