This is common, most people have a hard time comprehending the disruptive impact autonomy will have on the world.
To be short, you are thinking too small.
FSD isn't just about robotic taxis, its about TaaS (Transportation as a Service). People using robotaxis for ALL mobility, not just what we today think of as "taxis". The economics of robotaxis coupled with EV's and smartphone apps will enable most people to use RT's full time rather than own a car themselves, because eventually it will be cheaper for the consumer to do so.
Doesn't matter if you just use the RT to commute to work every day, or use the RT to travel cross country, financially it should one day be cheaper to do so rather than own and drive your own car. And sure some of us old coots who grew up owning cars will never make the shift, but you can bet the young will do it instantly if its cheaper and more convenient.
Lots of math has been done on this by lots of analysts and its nearly inevitable once autonomy is solved thanks to the EV. The economics of it virtually guarantee it.
Now whether Tesla is the one to corner this massive new market first is unknown, but seeing how great FSD v12.3 is and how fast its now improving, coupled with the RT being revealed in three months and entering production next year, well.....