There is no end-state for formats where one "won" and others "lost". XML "won" in terms of it being used everywhere in the past, JSON "won" in terms of it being

There is no end-state for formats where one "won" and others "lost". XML "won" in terms of it being used everywhere in the past, JSON "won" in terms of it being used everywhere right now and some other format will have "won" in terms of it being used everywhere in the future. Formats come and go over time, surely JSON will as well.