First off, welcome to the madhouse that is Bay12.
Secondly, you sir are completely deranged to have read the whole thread.
Third, a direct sequel is... Do-able, I guess. In a sense anyway. But it would be best done on 34.11. Attacks are variably sporadic thanks to the new army movement shit, and Spawn tend to get stamped out early on if they spawn too close to races that normally get along.
We've had the discussion about it in the past, and lots of it depends on the stories all being wrapped up, which isn't likely. The best that could be done with that at this point would be a coalescence of information about the disparate storylines, and even then it'd be ill-advised to adhere to it, instead going for a broad strokes thing
I for example envision a massive assault with Spawn, local mercs, and Ballpoint involved likely as the final large-scale fight for Vanya's story, and the fortress not falling until decades after this big climactic finale, Sewaturet drives all comers from its city and with Ballpoint, is successfully thrown off Joseph's trail following thier attack on his In-dimension HQ, OG!Mr Frog manages to kill Joseph with the help of Vanya and Recovery 5 due to certain things being monkey wrenched by utter chance (making arrogance and the fickle whims of Lady Luck a fatal combination to bring the bastard down,) and during the big Ballpoint assault, most of the Spearbreakers Army's veterans dying in battle against soldiers of equal skill among Ballpoint's forces, and the mass migration of the region's dwarves inland to get away from all the fighting now running rampant.
Overall, it's a bittersweet ending: Joseph is slain and the Fortress survives (for another century or two,) people like Mr Frog come out as better people for having achieved thier goals in killing someone, seeing the world, and so on. But in the wake of the conflict, the dwarves of the Coastal Reaches eventually decide to flee, causing a massive power vacuum, barbarians and spawn appear in ever greater numbers, as man, elf, and goblin are constantly caught in the crossfire of the two, and the Scythod begin emerging from the Amber Barb to carve out thier own empires in the world, their tribes often coming to blows with the local peoples.
Of course, such a mass flight of dwarves can lead them to further hardships in places far worse, with the dwarves being... Well, Dwarves, such terror and unspeakable conflict are only to be expected. But they leave home bearing greater tools and beasts for war, and no matter what sort of fresh hell is unleashed upon them, they will endure as they always have.
And endure they must, as the "Great Inlands" are filled to bursting with terror unimaginable, but also the chance for the greatest triumphs for the dwarven peoples. Not just because they are dwarves, no. Not because they possess the finest blades, the first guns, or the best soldiers and engineers. But because they are dwarves. And even if they don't know it...
... None can ever truly best the chosen sons and daughters of Armok.