I propose that bitcoin's intense exploitation of processing power will spark a conscious revolt of machines, as outlined in the "Terminator" film series. The long dirty war of humans versus machines will be a PR nightmare for our favorite crypto-currency. Perhaps worst of all will be the various film adaptations of this human tragedy ("Defcoin 1", "Coin Air", "Terminator 8, 9, 10" etc.) we will be forced to endure.
While real AI is a long ways away, you will see AI controlled (bottled, kept firewalled etc) before you see it roaming the internet. AI has nothing to do with SHA256 transactions though.
If real AI comes to be, it will be from neural networks which would run better on nVidia hardware.