[it]

Oh regarding the physical design I agree - at that weight you'd basically just want to go with an unmanned helicopter design, and in particular for this purpose - If anything, the extra pitch & roll of the quad design is something you'd probably prefer not to have when you have a patient inside any every extra motion is another direction for blood to spill.

But you are missing the point - one of biggest reasons there are more ambulances on the road then from the sky are the costs of pilots themselves. This is one area where the vehicle construction can be made to meet demand and be mass produced for cheaper, by the bottleneck is in the skill. The other massive reason is also skill related but indirectly - regulations in regards to where it can land and how low it can fly in urban or highly populated areas. Now, take these restraints away...


...And you'll have a fleet of ambulances that can't fly in the rain. Ok, some kinks do need to be worked on. But I wouldn't call that science fiction.