You never cease to amaze me with the number of questions here that cannot get the attention they deserve. Hope I can help you close this as this is a good question.
I believe that this is just to define a contract. The Service Links folder is more like metadata. You use it only for debugging and discovering (therefore * .disco) information about the service.
You should simply exclude the folder from live sites, since your web.config has all the information about the service's runtime (URI, etc.).
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