I agree. It's silly to think most breeds are as pure as they were at the moment of conception/recognition. Things such as a of lack of a "job" or situations such as war or famine will devastate local dog populations. This still is happening today. Revival=crossing. Which generation of a cross (for creating a new breed or reviving an old breed) would be considered a "breed" again? Many breeds today have been on "deaths door" at some point in their history. The infusion of new blood was the only way to save the breed. If still selecting for a type, or standard, would an F1 or F2 generation be that breed? Maybe further, say 50 or 100 years? Or is the race destined to forever be mutts?