I don't think my taxes/insurance costs/donations to charity are high enough. London (donation funded) has a helicopter service that attends 6 serious trauma cases a day. Denmark, Germany and others has a Helicopter Emergency Medical Service which delivers a senior doctor and paramedic. It probably doesn't scale well.

Basic issues like overhead powerlines make life difficult for helicopters. They are used in rural Australia as an alternative to road, but only due to time saving. In a city, well you get a road ambulance/paramedic/medical team.

The (Melbourne) Victorian Ambulance Cardiac Arrest Registry claims third best in the world in out of hospital cardiac arrest.