Good points indeed!To answer your question we must first establish some sort of criteria for a protection dog. My general statements are based on the presumption that the criteria would involve the potential for significant levels of mental stress and physical force. Work that requires a dog to have a strong temperament.
We can look to professions that use dogs in a protection capacity. In the USA these are primarily Police and Military. Dutch Shepherds, Mailnios and German Shepherd Dogs dominate these professions. Occasionally you see other breeds working but not Dobermann's. Modern day Dobermann's are virtually non existent in these fields.
We can look to sports that include a Protection Phase as part of the competition. Dobermann's do not occupy first (or second) place in these venues. In fact, not long ago I was looking at the results of some international competition and Hovawarts were doing as well or better than Dobermanns!!
We can look to successful private business that provide security services. These tend to be somewhat low profile and statistics are going to be difficult to nail down. I'm not aware of any of these businesses using Dobermann's though, are you?
We can look at the breeds reputable Protection Dog trainers recommend for serious family/home protection.
As another poster mentioned- alerting and barking along with maybe taking a weak bite at a someone is nothing special; lots of dogs will do that much. That isn't protection work.
People like me still want to give the Dobermann a chance. However, I also drive a 21 year old truck and hunt with a lever action rifle. I make those choices knowing that there are better tools for the job and I won't pretend otherwise.
The breed could be restored. Will it though? Show dogs and Pets are where the money's at...........
Yes, one can find examples of Dobes in law enforcement but they are overwhelmingly the minority. This was not the case in the past – I am thinking in the 1950s or 60s.
To my knowledge there are no Dobes in use in the U.S. military. This of course was not always the case. In fact it's my understanding that the U.S. Marines' mascot used to be the Doberman – the Devil Dogs. Now it is the nonsensical image of an Old English Bulldog, but that's a side note.
So I think there are examples of Dobes able to hack it, but they are rare. Law enforcement agencies and especially the military go with the largest resource of capable dogs, and that is not our breed. The Malinois, and perhaps its cousins, has become the favored dog. They have replaced the GSD, I think, due to a sharper temperament (on the whole) and superior speed and agility. @Prushanks may want to speak to this, as she has as a member of her family an awesome GSD that is a Police K9. Bear is a large guy and I recall Prushanks talking about how he has trouble maneuvering in small vehicles when searching.


) and his size is a hindrance. He has a hell of a time moving around in smaller cars for narco searches. He isnt as fast or agile (though in his hay day he could get'er done was a sight to be seen!) as the smaller "GSDs" who can literally fly.
) his Mal was also about the same range. And he (the Mal not the handler) was a grouchy one, lol.