The briefly proposed Afghan pipeline project would have had a very minimal capacity and was never a serious effort to undermine Russian dominance of Central Asian hydrocarbon export routes. The US of course cannot "control" Central Asian exports, and never could. Since the US doesn't need to control them, it's not a matter of any great relevance. I don't think the US interest in Afghanistan has ever been about controlling trade.
The Russian dominance of Central Asian export routes will of course eventually be broken by China, a process that has already begun. That's not something the US needs to be much concerned with.
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