With the windmill farm and pumps smashed to pieces, the dome can no longer be filled with magma. There were three fillings, the first to cleanse the dome of all meltable stone - this was the primary purpose of the filling, originally. The second filling was shorter, intended only to obsidianize part of the lake so a system for draining and refilling the water could be put into place. The third filling, which submerged the dwarven city under a sea of magma during the 190's and 200's, fulfilled a purely aesthetic goal - to turn the brown, muddied tops of the buildings into clean, sandy municipal parks of carefully cultivated fungi.
Safe with the knowledge that the dome will no longer be filled with magma, and filled with a new hope for the future inspired by the Quakedented clan, a restructuring of the dwarven city has begun. Passages which were carefully constructed with ramps, so as to allow passage but prevent magma leakage during the flooding, have been torn down, allowing free passage into and out of most buildings. A new entrance has been carved out of the central mesa to the cavern floor, allowing quicker access to the lakes and the cavern wilderness. As well, the walls which contained magma during the filling, but now only serve to block off the rest of the caverns, are being deconstructed.
In effect, the dwarves, having overcome their doom, have begun turning the dome into the utopia it was always meant to be.
And, unbeknownst to most of the last dwarves of the Merchant of Echoing, lurking just below the bottom layer of the dome, gathered into a small antechamber above a long stair, is a congregation of demons, staring willfully at the rough obsidian wall which was thrown up to block their entrance. There they stay, biding their time until the final battle in the heart of the fortress. Perhaps the ultimate doom of Weatherwires has not been averted, but merely resides below a few thin layers of rock, waiting patiently in the darkness.