I'm afraid SAS clearly have far too much faith in the media if they think that by ridding themselves of the Dash fleet, they rid themselves of all associated bad publicity. Only the most naive of fools would believe that should SAS have any more incidents/accidents on ANY fleet, that it will be seen as something totally different and unconnected to the Dash incidents.
An aeroplane is an aeroplane to your average person in the street, and any airline that has numerous incidents with any type is in big, big trouble. In my opinion, the damage is already done.