Taliban-Trump talk stalled. And if we are to believe NYT, it was reluctance from the Taliban side that broke the secret signing at Camp David. In that case this agreement might never get signed. Then what? USA has to do something like a no deal Brexit, exit Afghanistan without a deal. That should be a win for Taliban.
What if USA doesn't withdraw? Well then all those big promises from Trump that he delivered before election are as void as other presidents' talks that Trump used to attack for being void.