On the subject of this thread...
Despite the current sense of "never again", I think we must consider that we are in very volatile times. For that reason, I would suggest there is potential for "The West" to re-engage in conflict in Afghanistan
if circumstances arise that cause "line in the sand" decisions to be made. Predicting what those circumstances or events might be is difficult, but the human world does seem to be lurching toward some sort of cataclysm. One possible (I'm not saying probable) example would be the regrowth of one or more terrorist organizations based in Afghanistan. If such an organization began conducting attacks on a large enough scale on "Western" targets, all bets are off re staying out of Afghanistan.