I think it’s possible. I mean, how much does MySpace pay for advertising? (can’t be much…I’ve never ever seen an ad for MySpace) MySpace may be a bad example of this, but think of how many hits that site gets. It’s got just shy of 60 million users (well, user accounts) and if each of those accounts made 17 hits, that’s a billion right there.
But!!! I think it won’t happen. this thing will lose it’s momentum LOOONG before he gets into the 8-digit numbers.