I think 7.0 will handle the final confrontation of Hydaelyn and Zodiark then 8.0 will transition to us becoming Azem, not a god or ancient, but the embodiment of the wanderer to fix the wrongs in the world. Effectively what we were in 2.0 without knowing it, it will be us coming full circle and stepping into our own as our own person and not a pawn of the original primals. We'll still be mopping up the remains of the ascians and their plans, cleaning up the fallout of the fight and trying to sort out the power vaccuum that will likely be left in garlemald. Plenty of story fodder for another few expacs.