I never understand why people expect there won't be self-driving cars for sale to the public which voids the need for self-driving car taxis? I would prefer buy

I never understand why people expect there won't be self-driving cars for sale to the public which voids the need for self-driving car taxis? I would prefer buying such as car than keep taking taxis. In the end I think it would be much more convenient if you could call via app your own car in a similar way :) That's the kind of future I am imagining