I didn't read all replies, so I might have missed some important post, but here's my opinion based on the blog and some of the messages.
I'm against using Masuda's statement, as to me he's referring to a single universe, and I don't like mixing his words with other concepts, as we don't really know what he meant.
BUT
As someone already said (DDM, for example, I think) if the universe is infinite (in both time and space, stated by Masuda, Lucia and the ruins, if I'm not wrong), and there are alternate universes for each possibility, consequently there have to be infinite parallel universes, as the possibilities are infinite.
Though, nitpicking, I don't see in the blog an explicit mention to a universe for every single possibility, just for other possibilities. I may be missing something, but I think that to make it totally solid, we would need a statement of said universes existing for each possibility.
Another things, doesn't the "ever-expanding" space statement contradicts it being infinite?