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Well, if it's possible to build a human level intelligence, it's probably possible to build an intelligence that's much like a very smart human except it runs 100x faster. And in that case, somebody with sufficient resources could build an ensemble of 1000 superfast intelligences.

That's a lower bound on the scariness of AI explosion, and it may already be enough to take over the world. Certainly it should be enough to take over the Internet circa 2015...

To my mind it seems pretty clear that if AI exists, then scary AI is not far off.

That said, I don't worry about this stuff too much, because I see AI as being much technically harder, and much less likely to materialize in our lifetimes, than articles like this suppose.