Self driving cars are the future. Once there is self driving cars, the taxis will be as cheap as private cars on per mile basis when averaged over entire year. Most people would stop owning cars and large families may keep only one car. Also, this naturally leads to all electric cars as well. The taxis will take people to work in rush hour and then will charge themselves and will be ready in the evening.
Any business that depends on traditional car ownership is in peril. Gas stations, repair places, parts, dealers, car insurance, paid parking etc. Even auto makers are in big trouble because you will need far fewer taxis as they can service more people per vehicle.