The Afghan government seems to be on the edge of collapse and the US hasn't even left yet. ANA soldiers are deserting and fleeing across the borders to their Central Asian neighbors. Some generals are drafting untrained civilians to plug the gaps, and the Taliban have isolated many provencal capitals so that they can only be supplied from the air.
The empire is fading comrades, the war is almost over.
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Well according to the agreement signed with the Taliban they are supposed to withdrawal all "soldiers, advisors, and contractors" and the Taliban said if anyone is left behind it's a violation of the treaty. I'm sure the US has some covert plans but they'd want to work through the Afghan government. If the Taliban control the country it might be more difficult to pull off.