I have sent out quite a few nice frames to get repairs... seems like a lot of early 80's Japanese frames suffer from a very similar dropout failure on the drive side but are otherwise very well made and well finished bicycles.
The single repair cost $60.00... replacing both dropouts pushes the cost up a fair degree and then there is also the matter of having the rear stays repainted to match.
In most cases these have been well ridden and well loved touring bikes and models that are not easily replaced and I have a number of frames I would repair before I'd replace them if they suffered the same type of failure.
Since the Super Sport is in for re-painting anyways the repair cost will not add a lot to the total restoration cost.