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If there's an "announcement as early as next week to quickly reduce the 4500 United States troops still left in Afghanistan," then there'll be a huge difference between going to zero in next two months or going to previously reported possibility of 2500. https://www.nytimes.com/2020/11/13/us/politics/trump-afghanistan-troops.html?action=click&module=News&pgtype=Homepage
Difference is greater than the numbers alone indicate. As @JJSchroden has noted, all troops out would likely mean all contractors, too. Also, US Embassy probably would evacuate - maybe except for a small number that could pull out quickly via Kabul airport (b/c no more Bagram).
Quickly reducing to 2500 would narrow Biden Admin options and undercut peace talks, but wouldn't create the utter upheaval of going to zero that fast. Going to zero would be withdrawal simply for the sake of withdrawal and could not credibly be characterized as responsible.
Of course it's no surprise that Trump wants to get out of Afghanistan, but an abrupt policy move in the 11th hour of his presidency would be reckless. Going to zero by January would amount to burning down the house on the way out the door for some perceived political gain.
Trump had 4 years to responsibly wind down American involvement in the war in Afghanistan. He didn't do it. The clock has run out, and it's now time to let his successor decide what to do.
