Make the men regrow their beards? Force the women to don burkas once more? Shoot every child flying a kite or listening to a portable radio? Doesn't leave much time to prosecute a military struggle. And there is the logistics of staying resupplied. The Northern Alliance has taken custody of, or blown up, most of the ammo dumps and fuel supplies abandoned by the Taliban and al-Qaeda when they fled.
All good ideas. They will probably want to reopen those bioweapons labs too.