"In a bigger sense, this victory by Sedol could also mean that no matter how “smart” general artificial intelligence becomes, there may always be some weaknesses that can be exploited by humans, even if they would be increasingly harder to detect."
This seems like nothing more than wishful thinking -- "no matter how smart they'll become, we humans will always have the potential to outsmart them! We simply must have!" If the AIs become so smart that the weaknesses become not just "increasingly harder to detect" but "humanly impossible to detect", it's an entirely moot point. It's also a little silly because, of course, every *human* intelligence has weaknesses that can be exploited, and often quite pitifully so.
No, my friends, we are facing the very real possibility that we *will* be able, one day, to build machines that are better than we are in every area we'd like to think of. Rather than hide from this terrifying prospect, we'd better consider our options carefully, and in particular, we need to be very careful about how we go about building such machines and how to make sure they don't accidentally or intentionally do terrible things that we're not clever enough to foresee. Killbots a la Skynet is just one (clichéd) extreme, and not necessarily a realistic one, but AIs don't even have to have malicious intent to really ruin our world. Just look at what we do to ourselves, for starters...
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