This point is by Bill Dembski: it's possible that Rubenstein knows nothing about piano yet hits keys randomly right before perfect music plays. His point is to show that if an infininte number of universes get rid of the anthropic principle, it gets rid of a whole lot of other stuff besides (including, I would add, science).
How about defining it as an instance of functional complexity? And treating the list of properties as following necessarily from this definition? Okay, this is very diamond-in-the-rough (or perhaps zirconium...) but here goes my thoughts on the matter: (Complexity) Many diverse parts (functional) acting for the sake of the whole I think I need to add something like "not as the instrument of another" or something like that. Given that they act together as one whole and given entropy, etc., the organism will need to posses more order than its surroundings (homeostasis). It will therefore need to take in energy (nutrition), which it will use to sustain its readiness to interact with its environment so as to preserve its own being (homeostasis again?), but which will eventually break down (death), so that in order for that life form to continue it will need to duplicate itself (reproduction), which, upon occurring, will involve both development (growth) to maturity and...
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I suppose if the infinite variations truly represented every logical possibility, then there would be no true underlying physical laws. (As far as I'm aware, though, this isn't what multiverse proposers say.) In that case, there truly would be no "laws" to speak of! Is that what you mean by - there would be no science?
Uh, thinking about what I just said, I am not so sure that the word "bloviation" doesn't apply, but in any case, it's my story and I'm stickin' to it.
Regarding infinite variations, I like what Dembski says. He is having fun with logical possibilities, which include a lot of things that, if taken seriously, would seem absurd to us. His real point seems to me to be that if an infinite variety of universes includes these logical possibilities, then how do you know that you don't live in one of them right now? And to the degree that you are unable to give an answer to that question, science no longer seems to look that much like knowledge and more like wishful thinking, i.e., science looks rather unscientific.
In any case, the claim that there is an infinite variety of universes isn't the same as the claim that every logically possible universe exists. If the latter is the case, then the former is too; but not vice versa.