I find it bit contradictory with your previous post, you said US don't need whole army but few advisers are enough to continue this war and few advisors won't effect much to massively huge US forces despite they are deployed in all over the world. second you said it won't put any burden to US economy so why US want to pull their forces in middle of war, A war still indecisive. This will impact all the 17 years of effort they done against taliban.
Taliban still can fight for long, They are known for their hit and run tactic. They usually don't intend to occupy, So the compromise will not come easy, Taliban are at their resurgence and will demand more, Is US really ready to compromise that big?