I'm wondering how likely it is that China is going to have their turn on the Afghanistan merry-go-round after we're out. If they do I suspect they might have an easier time in terms of the logistics of putting boots on the ground, but I suspect it's not going to be pleasant for them and it'll probably burn them out heavily.
Everyone loses when it comes to this sort of thing, it seems to me.
EDIT: On the other hand, China has made nice somewhat with them presumably because having US forces in a country that borders China can't possibly be reassuring to them, but I can see things breaking down into a complicated mess once we're fully out of the country.
An alternative is what might happen if the Taliban actually manages to take control over most of the country. If they do, given those tribal distinctiomn and other cultural issues, I suspect they're going to have a Bad Time trying to actually hold onto the country and make anything resembling a functional government out of it.
It'd be a bit poetic if the end result is that the Taliban falls apart basically to the exact same problems that has made it the graveyard of empires, but even if that goes sideways in the most fitting manner possible the human cost is going to be immense.