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Honestly, it depends on many things. There are girls like Ina, Miko or Haachama who seriously considered leaving only to end up staying, and there are others like Rushia or Mel who looked like they would hardly leave any soon, only for everything to fall apart out of nowhere. This can also apply to life-related stuff, because the loss of your parents or some other shit like that can cause someone to lose all their motivation, and I haven't even talked about the girls' health.
Basically, hard to predict 10 years in the future when we hardly have any idea of what's going to happen in the next month.