The demand for taxis/ride-shares is not going to change significantly with the advent of robotaxis. Robotaxis will compete with existing taxis and ride-shares, with some people preferring robotaxis, and others fearing them. It is preposterous to imagine that anywhere near Tesla's entire car production could go into its own, brand-new ride-hailing service.
Further, there is nothing disruptive to the ride-hailing business about robotaxis. They will compete with Uber and Lyft and taxis, but they will be indistinguishable from them other than the novelty. It is ludicrous to imagine that people who keep their private cars in the face of the availability of taxis and ride-shares will suddenly sell them because now robotaxis have been added to the existing ride-hailing mix.
Not to mention that the supposition above (that Tesla is the first with L4/L5) is wildly speculative on the face of it.
Some people live where ride-hailing services are not economically feasible due to low population density. Far more people simply like the convenience of a private car. You think people are going to abandon their BMWs and Mercedes and Mustangs to take a robotaxi that they have to wait for? You think soccer moms are going to be willing to wait for a robotaxi van to pick them and their four crying kids up from the grocery store while struggling with a shopping cart loaded with food that needs to go into the fridge or the freezer? While the ice cream melts and the butter gets soft and the milk goes bad in the sun?
When I broke my arm and was on pain killers I had to take an Uber to the grocery store. Then when I was ready to leave I had to call for another and wait for it. Let me tell you, I was so glad when I was able to drive again!
Once again. You are looking at it from a perspective of what's currently available and not what is coming.
Uber/Lift is great for certain situations, but bad for others. You don't have privacy like you would in a robotaxi, you're limited by who is willing to pick you up, etc. The cost of robotaxis will be much less than uber/Lift, and that will be a very compelling argument for most people.
Nobody is going to sell their car to switch over to using solely robotaxis, but they will not buy a new car and instead use the service.
I'm not assuming that Tesla will get there first. I don't know if they will EVER get there. I'm saying that SOMEONE will get there, and I have a hard time seeing a future where what I've described doesn't come to fruition once they are available to people.
I definitely don't think all Mercedes/BMWs will stop being used, all I'm saying is that for people who have wide access to them, it will be the most affordable option, and for the vast majority of people (>70%) the value proposition will be too high to resist.
Assuming that all of us own Teslas in here, were fortunate enough to be in positions to afford what is considered a luxury car, and we chose to spend our money on that instead of a cheaper car, and the rest on other stuff. I mean hell, I (and a lot of us) spent more money on software that we don't know if we'll ever see a benefit from than some people spend on a car.
I don't think robotaxis will be like current ride hailing. I think it will be a subscription. I believe you will pay something like 200-300 a month for access to the cars whenever you need them. Will it be more inconvenient than having your own car, of course, but for the vast majority of people, paying $200 a month instead of $800 a month for a car payment/insurance/gas is more than worth the difference in convenience. With the algorithms, you'll have a car ready every time you need to go to work, or home from work, etc.