On that Wheeler quote

“The universe has created an observer and now, in an act of quantum measurement, the observer looks back and creates the universe.”
— Read on www.kateva.org/sh/

Something like this I think. But not a full Boltzmann brain. More like the origins of life on earth. A small fluctuation of quantum foam that does a local measure. The Planck unit of measurement, or pmeasure. That propagates, and in no-time at all we have a slice of universe. Bit like every stone block holds every sculpture.

Maybe explains Fermi Paradox?