JHE
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A friend who worked there thinks it will end up with an Ulster-style solution - i.e. some Taliban being invited to join the government. But it could be decades before either side is war-weary enough for that sort of compromise.
The (strange) political arrangements in NI came about (I agree) in large part because people were weary of the bloody conflict.
I can't really see how that relates to what might happen in Afghanistan.
Most of the ordinary people, we can assume, want peace. That's one reason the Taliban were initially welcomed in some areas - they established peace, by defeating their enemies, and law and order, of a severe Islamic sort.
But do the Taliban want to compromise? Their reputation is as fighters so convinced of their Islam that they die willingly, in the belief that they've found a short-cut to paradise.
If there were some sort of power-sharing deal, how would it work? The NI system is about Unionists and Nationalists sharing power. What is the equivalent in Afghanistan?
The only compromise I can imagine is that the Taliban take the Pashtun areas and allow other factions to take other areas. Is that the sort of thing your friend has in mind? (It's not like that in NI.)