Personally, I can't imagine him thinking it would get this big while he was creating it, which would have been somewhat arrogant to think.  I see him as rather humble, but perhaps I need to read more of his posts.  I'm sure he "knew" something (almost) exactly like Bitcoin (easy, lightweight, many applications) would prevail because traditionally fiat sucks compared to Bitcoin, but that's not really a difficult conclusion to land on.  The real question isn't "current fiat vs Bitcoin" though, wherein there's a very obvious better choice; it's "whatever could be next vs Bitcoin."

Then again, he's far more brilliant than I am & perhaps he really did just see the light.