I think the problem is putting labels to people's roles in relation to that acronym that has done so much damage to the industry (BIM projects, BIM people, BIM meetings, etc).
Architects have been managing information for a long time now, either adhering to national or self-invented standards. Information management has been, is and will be part of every designer's job. Having a person managing the standards of how information is created, audited and exchanged has been, is and will be necessary.
Especially with the introduction of ISO19650 and the fact that this is gradually adopted by many countries around the world, information management will be a priority for architectural practices.
What is real difference between BIM Manager and BIM Coordinator?
Coordinator is coordinating models (IFC import-export, federate various models), and manager is saying to him how to do it right way according to the standards? Who from two of them under control of companies standards, template and libraries?
Can you be both BIM Manager/Coordinator at the same time?
If BIM does not have future? It was commercial invention of AutoDesk when they started to sell Revit. Before that ArchiCAD did not create BIM - it's been working with Virtual Building (™). Maybe in the future some company will introduce different name for that: AIFC - Artificial Intelligence Forced Construction.
My opinion - do not stress out your boss, call yourself Architectural Technologist and be able to solve any complicated tasks you are facing at work, is it BIM, CAD, planning, detailing, engineering...