HEMS flies 24/7/365, any place, any time, point to point, etc. Seems the Coast Guard is the only other operator in the states to do that - of course they have two pilots (no shocker there), great training (to include extensive IFR), good equipment, high standards, and then they just go get the job done - with rarely an accident.
US HEMS needs two pilots, proper equipment, full IFR, great training, and a drastic reduction of distractions - but it will take a mandate from government types to get it done though I doubt any will have anything to do with exposing themselves to this trail.
My guess is that what is going to happen is more strict criteria by which HEMS aircraft are dispatched, thus reducing the number of flights, total risk volume, and total number of operations remaining financially viable all leading to a reduction in the total number of accidents to the point where the concern disappears from societies' radar.
When this happens politicians and all the other industry hangers-on and pundits will point to their great success in sorting multiple variables; albeit we'll be no better off as the real accident rate will remain the same.