Alright, I was 100% shitposting until now, but let me attempt to make an actual case for ORNJ:
Completely from a writing prespective, M&K have shown an interest in developing Oscar's character that the fans do not care much for (with good reason). Monty had Jaune have his big moments in V1 and V2, so we can expect him not to have any more major Arcs (heh). Making Oscar/Ozma leader of ORNJ is both extremely practical in-universe as well as from a writing viewpoint if they want to keep developing Oscar as his own, separate persona.
This said, two options:>Jaune gives up leadership willingly
He understands he is relatively speaking nothing more than a pawn in Oz v. Salem and he won't have any chance of joining the Big Leagues anyway, so he shows some humility and gives space to someone who definetly would. Oscar deals with the burden of leadership with Ozma's advice.>Jaune doesn't want to give up leadership
We get one last mini-Arc (heh) wherein he is forced to accept his mediocrity in a cutthroat all-out war, that not all men are born or even become equal and that he can't live up to the family legacy in the way he wants to. Has to deal with accepting failure because this is what adults have to do. Sets up more Oscar/Jaune interactions later (not Ozma) dealing with Jaune's possible obstination or Renora's. Then he surrenders and they can start paving way for Rose Garden if they want to make to a thing. This would definetly set a darker tone to Remnant that has been on/off at best until now.
(I'm a sucker for grimdark if you can't tell.)