Yes, absolutely. I think it could be used by any kind of first responder who has the ability to deal with a crisis situation but may not have that medical expertise to deal with it.
The automatic external defibrillators you talked about that are across the country are great for anybody who has succumbed suddenly to a cardiac abnormality, but that's not what everybody needs emergency access for. The AED will not provide any help to somebody who does not have one of those rhythms that needs to be shocked, whereas the Doctor in a Box will be able to help assess the situation and provide guidance.
An ER physician with trauma expertise could help by talking to the people who have the ability to be guided remotely on how to deal with the crisis at hand. I'm not sure it would work as well as an AED on the wall, and the public may not have the ability to respond to talk from a doctor like that, but police, fire, and EMS services for sure would be able to benefit from that.