Well, it would certainly fit from a narrative perspective.
As much as N'zoth will be important after 8.2. The final raid has never deviated massively from the initial premise of the expansion, and the initial premise of the expansion, as it was marketed and as the intro quests show. BfA is about faction war, as much old god related stuff as there is, the premise of the expansion is still Faction war, just like how MoP was also about faction war.
The final raid will be about Horde v Alliance, or more likely Horde and Alliance v Sylvanas. If N'zoth is part of that raid then he would have to be sidelined massively.