Holy moley, your figures are way off. Per consumer reports, "Most Lexus models have relatively high maintenance and repair costs (primarily due to maintenance), despite their excellent reliability. The Lexus ES350 racks up an average of $2,300 in maintenance and repair in the first five years, about twice what you'd pay on a Buick LaCrosse." A full order of magnitude lower than your proposed cost at only $460 a year. Your figure is closer to the "total cost of ownership".
Most cars "last" well beyond 5 years these days. It's well documented that the average age of cars in the usa is over 11 years.
I could see the new unproven auto-driving parts failing sooner so I'd want a warranty to cover them for 8 years. I have an 8 year/120,000 mile warranty on my current car.
Similarly, a recent study showed for the last 10, 20, and 30 years the average investor has only made between 2 and 3% annualized return in the stock market after taxes. (Forbes) Likewise, I'd love to know where you can find a 2% CD from a trustworthy safe source. Best I can find are all 1% or lower.
Similarly- you use your car for things besides going out. Shopping, vacation travel, emergencies, visiting friends and relatives.
So you need to add in a lot more taxi rides and a couple weeks of outright car rental.
I get it, you are enthusiastic- but you are shading every fact you want to be true to be larger than reality while discounting or outright omitting every fact that undercuts your position.
Just 4 taxi rides a week for a year is close to the total cost of ownership for a car. So you need to add the cost for public transportation to work twice a day. And to be fair, you should value your time spent waiting for a bus/train/taxi at your hourly rate. And you need to add the cost for car/truck rentals (and the time it takes to rent them). Finally, there are intangibles like waiting in miserable weather outside the club after it closed for a taxi to come get you. Or when your parents/syblings/best friend/you have an emergency and you sit waiting for a taxi instead of dealing with it immediately. If you had to take an ambulance instead of a taxi, that's closer to $1200 (or more) for just one ride.
I agree the are cases (as I said- vertical cities) where taxi's work well. Taxi's are not a panacea and their utility comes and goes in cycles. Some years, it gets pretty bad (especially no-shows or refusal to pick up certain people padding the fair with a circuitous route, etc.).