Even if MX were to be revived, would the revived carrier still remain part of OW? I guess it depends on whether the same corporation is revived, or a new one with the old name. I believe that RG (Varig) was booted for *A before its ultimate demise, but AZ (Alitalia) was never formally booted from ST even though it resumed operations as a completely separate corporation. I don't know how directly applicable either situation is.

One of course would hope that the "new" MX will remain part of OW, but I don't know that this is a given.