Can you outline how this is supposed to free us from car-centric infrastructure? Unless it's coupled with style kind of Uber-subscription dystopia we would still need room to park all of these vehicles. While downtown parking can be a problem, garages aren't, and neither of these problems is on there scale of the larger infrastructure problems.
The biggest problems with car-centric infrastructure are that they require a huge amount of ever-larger roads to funnel people (in cars) often tens of miles to do anything. Even in the rent-a-taxi scenario you would still need these roads, which would probably need more maintenance, not less. And all of that sprawl has knock-on effects as roads create divisions in communities, and low-density housing, enabled by car infrastructure, means you have and know fewer neighbors.
At least the Uber-style infrastructure doesn't require oversizing everything. Even if my car is used 90% of the time for commuting by myself, it has to be big enough for the other 10% of the time when I'm taking the family and our luggage.
The biggest problems with car-centric infrastructure are that they require a huge amount of ever-larger roads to funnel people (in cars) often tens of miles to do anything. Even in the rent-a-taxi scenario you would still need these roads, which would probably need more maintenance, not less. And all of that sprawl has knock-on effects as roads create divisions in communities, and low-density housing, enabled by car infrastructure, means you have and know fewer neighbors.