I briefly brought up this point while discussing the argument from first cause. In that case, I explained the so-called ‘fine-tuning’ of the universe by saying that a generic cause to the universe, whatever it is, is highly unlikely to stop working, and so would result in a multiverse: multiple universes making it easily likely some would allow for life.
Some people find a few issues with a multiverse, but they generally seem to hinge on a misunderstanding of what it actually is.
Personally, I accept the idea of a multiverse. Let’s move past it, though: is it possible to explain the apparent fine-tuning of the universe, in a situation where this is the only universe that exists?