What very few people in the West know, is that the principle occupation in Afghanistan is farm labor. Usually, they grow enough food to feed their people, and even export a bit. If you are doing farm labor, what difference does it make if the guys walking around with machine guns are American or Taliban. Doesn't get the wheat crop harvested. Or fruit dried. Or carpets woven.
All the economic activity will continue. The Taliban can't improve it. All they can do is to make things worse. For example, they can take over the copper mines, but they don't know crap about copper mining. So good luck to them. Afghanistan is where empires go to die. It's a tar baby!
Maybe Iran will try to take over when the Taliban fail.