People do go back, yes. Unfortunately, there's no way to know who, or when.

[Her eyes lowered so he wouldn't see the hints of sadness behind them. Much as she loved being in Keelai...five years' time meant five years worth of goodbyes--or, worse, people disappearing on her before they had a chance to say goodbye.]

I'm not going to pretend I understand everything about how magic works, so I might even have some of this wrong, but...I think the person who originally started the spell that brings us here and sends us home is the same person who died a long time ago. But the spell is still working, somehow. And there's no way to control it now.