It is by now fairly obvious that, within 30 days of the final handover to Afghanistan's security forces of all responsibility for maintaining order, the Taliban will have taken control of the whole of the country as opposed to the large swathes of it they presently control.
I find that incredibly unlikely.
Remember
the Northern Alliance was at war with the Taliban government for many many years, and it was their forces, with Allied air and SF support who defeated them.
With the arms and expertise they've built up over the years I can see no way the Taliban would make any substantial inroads into their homelands in the north. The question would be if they ended up in an uneasy national alliance or another prolonged civil war.