In discussions around multiverse hypotheses, what is the extent and current state of conversation around why the multiverse configuration (whether one or many multiverses, etc.) is one which generates/includes universes such as ours?
That is to say, consider that a multiverse could exist in any number of forms. Perhaps that's not the case. Or, perhaps it only contains two lifeless universes, for example. Or it contains an infinite number of universes, all alike. Or it contains a large or infinite number of universes, varying in nature. Or perhaps there are an infinite number of multiverses, making it inevitable for some of the multiverses to contain universes such as ours.
Further, if there's only one multiverse, is there discussion regarding the particular attributes it has, and why it has those? Or contrariwise, if more than one multiverse is needed to give a reason why we exist in one such as ours, what contains them, and what precludes an infinite regression of multi-multi-...multiverses?