Would Microsoft consider having Yammer, SharePoint, OneDrive, Stream as elective certifications? In large organizations the technical knowledge is still necessary especially during the implementation and adoption stages. Perhaps they may even have a place in specialty certifications. I know the teamwork certification use to exists and no longer does.
For the larger technology areas like SAP the chances are higher as we have see when the SAP specialty was announced. The smaller the area (read market) the smaller I see the chances that it will be a separate exam or role. I do hope for e.g. SharePoint or Teams Voice something like that would happen but that is just me hoping.