That would mean only 80-odd people know about IA, which seems a tad low :P
I suppose that means that for most people, 99.9999% of the world's population don't know they exist. Interesting thought. I wonder which living person is known of by the largest percentage, and what that percentage is?
I would wager that 95% of web users do not even know that IA exists, let alone that they can use it.
> Does it matter than what the current namespace is?
As long as it's the only thing a browser will consider to retrieve information, yes. Which is why cool URIs don't change.