2 and 3 wont happen. The USA is done with this war, mentally and emotionally. India has seen what happened to USSR, USA/NATO and they know they would 1000x harder....no boots on the ground.....they will provide weapons, training and money.
I'm not sure how the Kabul government as currently constituted will survive. I think the Kabul Government and ANA could split into various factions. Ghani and any pro Kabul Pathans will be abandoned in Kabul and left to the Taliban. There loyalties may be bought though and they could change sides. I hope this is the case since Kabul is much larger it was in 90's.....no body wants a blood bath.
The old northern alliance factions (Uzbek, Tajik, & Hazara) will take as much ANA weapons as possible and harden there ethnic regions.....I've heard this is already occurring.
From here I see:
1) A full blown civil war that the Taliban will win but not completely (the Tajiks will retain a small independent enclave), repeat of the 90's
2) A partitioning of Afghanistan (not very realistic..many factions would oppose including the Taliban)
3) A loose federation of different factions with a weak central government...no real executive, just a loya jirga. Each region rules itself.
Wild Card Option:
4) A Military dictatorship. A faction within the ANA would launch a coup and eliminate the Kabul government as the USA leaves. Most likely would be a Tajik faction since they run the ANA.... Unless ISI can bribe and back a Pathan general to do it first.
I think 3) or 4) are the best options for fast peace. However, it looking like 1) is the most likely too happen.