I agree that conflict over Central Asian energy resources is a real possibility. I do not think it's likely to involve the US, for reasons of geography a relatively minor player in that picture. It is a very likely Russia/China flashpoint somewhere down the line. The Chinese want the oil and gas: it's the only really substantial supply that they can get that doesn't rely on vulnerable shipping routes. The Russians don't need the energy, but control of the transit routes from Central Asia to Europe gives them a lot of leverage over Europe and over their former possessions on their southern border... maintaining that sphere of influence is important to them for a lot of reasons.
I don't think that conflict is likely to involve Afghanistan or Pakistan at all, and I doubt that the US would have any ability to deter it even now, though there's little immediate prospect of it erupting. Another one of those things we don't and won't control.
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