Hell no. We need to make damn sure that doesn't happen. They should be paying us.
That's about as likely as us getting reparations from the Germans and the Japanese for WWII, let alone the return of the massive amounts of grants we sent in their direction in the post-war era. This is after the Germans and the Japanese killed 300K and 100K GI's respectively, during wars in which we spent 2x annual GDP fighting or roughly $32T, if we scale up to today's GDP.
My guess is that we'll pay in one way or another, either through financial aid to keep the Afghan government going, or economic damage after a series of devastating terror attacks stateside once the Taliban takes power and revives its relationship with al Qaeda, in addition to trillions spent on yet another punitive expedition in the region. The difference between Afghanistan and North Vietnam is that the Vietnamese communists never thought of attacking us on our soil. Like I said earlier, I think it's a reasonable political proposition, given that any terrorist attack stateside would be on mainly Democratic territory. The only problem is that as taxpayers, we will all incur tax liabilities from the trillions in war expenditures that follow such a terrorist attack.