If EMS has to "search you out" so does the drone.
At least in my County, we actually get very good triangulation info from 911. It was very rare that Dispatch told us they only had Level 2(IIRC) location info (which might be to several hundred feet).
FAR more common was people who actually told us the -wrong- location. Car accidents that were several miles up the road from their location. Saying Blah St SE when they meant Blah Rd NE, etc.
Drones don't solve for that problem. They're going to the wrong location, too.