Everyone likes to point out that AFG has always been the "graveyard of empires" and that history is repeating itself.
True, but the lesson has also always been that AFG is ungovernable even for Afghan governments. The only thing that has ever caused AFG to pull together somewhat is their common hatred and opposition to having foreign occupiers. In between those periods it functioned as a feudal system with some kind of group in power in Kabul and then whatever happened happened out in the provinces.
So this is the dilemma now for the Taliban. The high point of the support is in opposition to the Americans. Just as the Mujahideen got their support from rallying the grab bag of tribes around opposition to the Ruskies but they were eventually moved out of power after the Russians left. The good news for the Mujahideen/sp was that the Ruskies were leaving. And the bad news eventually was that they left. So, yeh, the Americans have run into some "history repeating itself" but the the Taliban going to get a dose of it too. Whether it will be for the better or the worse we shall see. Last cycle when the mujahadeen were moved out, it was for the worse. Doesn't have to be that way. Just saying that is how it went last time.
China and Russia have their hands full there too trying to keep the Taliban influence out of the various "stan" countries just up the road. A pile of Uiyghar countries that have their own ambitions and need for revenge against Russia, China, and Iran.
There is no denying the Taliban victory but the notion that everything is clear sailing for the Taliban, Iran, Russia, and China in that region now is absurd. We got problems. They got longer term problems.