I have always been fascinated with our immune system and, although it is not my specialization, I have been reading about it lately.
Auto immune diseases are particularly interesting because it seems that our body have a given number of systems that protect us from creating auto antibodies, and when these systems fail, we get an auto immune disease.
Ignoring any technical limitations we have today (eg. the fact that we are still unable to perform gene editing in-vivo safely), knowing what we know today about the immune system, theoretically how could we stop our body from producing a given (auto) antibody?
Maybe using a vector virus that when injected would kill all effector and B cells with those antibodies in their surface? Maybe injecting a B cell type that creates an antibody that would attach to the target auto antibody and neutralize it? (Just wild ideas, I have no idea if they would work even at the theoretical level).
PS. This is not opinion based, this is factual based on the theoretical possible ways to stop an auto imune response based on our current model of the immune system.