Let go of any genesis theories - Effectively this has already been done in the thought experiment that postulates eternal inflation and the bubble universe multiverse that comes with it.
Just not measurable by human standards - agreed to even by eternal inflation speculators, they see few if any chances of measuring the existence of other universes outside ours as they lie beyond the observable horizon.
Forget the furthest objects. I have to agree, humanity will never reach the nearest star outside the solar system, the distance and the cost are beyond us. Warp drive is and will always be science fiction in our lifetimes.