In New York, London and San Francisco? Sure. Anywhere else, there isn't enough density of destinations and density or wealth to make on-demand service competitive with hired cars.
That said, the full-time requirement would also wipe out taxis in most cities. That turns a broken-down car for anyone but the wealthy into a potentially life-destroying experience. Weighed against the benefits around drinking and driving, et cetera, something between full-time employment and the current situation seems apt.
In New York, London and San Francisco? Sure. Anywhere else, there isn't enough density of destinations and density or wealth to make on-demand service competitive with hired cars.
That said, the full-time requirement would also wipe out taxis in most cities. That turns a broken-down car for anyone but the wealthy into a potentially life-destroying experience. Weighed against the benefits around drinking and driving, et cetera, something between full-time employment and the current situation seems apt.