The more we learn the more I'm unsure of whether it is a wonder anything exists at all or whether considering the scales of time involved (and hypothetical metaverse) whether it was all inevitable.
Fun fact: it's very easy to rule out a multiverse theory where travel between universes is possible.
If the multiverse theory is correct, every possible combination of universe is out there. This means there is a universe which formed in exactly the right way such that the citizens all decided to leave their universe and invade our specific one. They formed 10 billion years ago and completely annihilated all matter in our universe.
Since we are still here, either the multiverse is false, or travel between universes is impossible.
This reminds me of Stephen Hawking telling John Oliver that the latter dating Charlize Theron is beyond the bounds of scientific possibility in any of the infinite parallel universes.
Says who? There are an infinite number of real numbers that have only 1s and 0s in their decimal expansion.
Only the ones in which we all didn't get murdered are having this conversation.