It won't happen.

Strong AI presupposes that there is nothing unique about biological (as opposed to non-biological) intelligence; that intelligence is an entirely generic commodity, which can be expressed by either biological or mechanical entities to an equal degree. There is no proof for this assertion.

You might get someone growing an organic brain of some type, hooking the wetware into a machine, and then calling *that* strong AI. Purely mechanical/electronic (chip based) strong AI, however, will not happen. There is a limit to the degree to which chips can miniaturise on a per-node level; and per-node miniaturisation (as well as it being decentralised) is the key to intelligence.

I also don't believe, for the record, that the fictional Skynet was true strong AI. It was very smart weak, but still weak. It still worked via attempted pattern recognition, when it came to fighting the Resistance; and when it couldn't find a pattern within Connor's guerilla tactics, it didn't know what to do. It was programmed mainly for strategic scale (as in intercontinental, remote war with nuclear weapons) rather than tactical scale ("boots on the ground," in specific, localised theatres) warfare, and when it was confronted with a need to adapt to the tactical scale, it experienced extreme difficulty.