None of those points have anything to do with the number of taxis and everything to do with regulation of the taxis that exist; perhaps that's a limitation of t

None of those points have anything to do with the number of taxis and everything to do with regulation of the taxis that exist; perhaps that's a limitation of their ability to regulate and enforce, but that should be the bottleneck preventing taxis from staying on the road. That is to say, the answer to 'we can't enforce all these taxis' isn't 'let's enforce no taxis'.