Eh, there are actually different versions of the multiverse, each suited to addressing a specific philosophical failing. One for the idea that our universe is a one-shot event just happened to satisfy the anthropic principle, another for the nature of quantum waveform collapse, and another for string theorists because they can't actually get their math to mean much of anything.
Speaking of which.
Looked up that title and found this: http://www.math.columbia.edu/~woit/wordpress/?p=6551 Not promising.
Interesting take on it, but it mostly seems like cherry picking. I do agree that it's all (level 2 and above) pretty much informed speculation. The author makes point explain two massive unknowns which would further light upon situation one way or the other.