We gather power and we plan for just such eventualities so that we don't go into them blind.

[For once, there is no self-deprecating joke in Ignis' word choice. He is completely serious. Plans change all the time, at the drop of a hat, but they can still give direction even when they change.]

I could give you the answers you want to hear to those questions, but the truth is, I don't know. However, if we can discover and take control of the power that brings us here and sends us away, then I see no reason why we cannot return together. We merely need to choose when we wish to return to.