Even if we ALL had 1 million computers dedicated to this and we ran it nonstop. Considering that its 32 bites, it would quite literally take 7 hundred million lifetimes to brute force. You can rule out the 000000000000000's and the 1111111111111111's but every combination following would take such a substantial amount of time.
And then even if we lived that long, our keys are perconsole. The algorithm that the games are signed with figures out our individual key using 2 keys that sony put in there. Even if this program used the algorithm it doesn't matter, because it needs 2 pieces of information it doesn't have. So it just starts guessing, from beginning to end.
I understand your point, but the author knows this, that's why he says it's better to have something to do than magically waiting for cfw to be brought on a velvet pillow. Mathematically it can be calculated, and you may get lucky at some point and find it early (which is part of the point). But yes, realistically it would take entirely too long to do this.
Not sure about Sony's massive 32 byte keys, though. Holy cow! Maybe we should build a bank of PS3s with OtherOS and use the cell to break it.