Townbrush has actually been doing surprisingly well in the past few months. The Fortress has adapted to a much smaller group of Dwarves, so the industries have stabilized and we are actually making progress. I'm finally going to construct bedrooms for as many Dwarves as possible. For over 11 years they have all lived in the community dormitory and thrown their personal items across the fortress. Hopefully that will no longer necessary.
Part of what I can attribute to Townbrush's recent success is the lack of goiblin aggression. Ever since the failed siege, the Goblins haven't approached Townbrush. Perhaps they no longer consider the Fortress to be worth their trouble, though I know that is just wishful thinking. So I've begun preparing for their arrival. I'm going to use them to solve the Fortress's undead prisoner problem. Over the years Townbrush has accumulated a huge number of caged undead, and have no method of efficiently disposing of them. I've begun unloading them on the caravans, but I've figured out a more productive use for them. I'll place their cages outside the fortress walls, then link them to a single lever. Upon being pulled, the undead shall be released and will swarm towards the goblin horde. I don't expect them to kill them, as the local undead aren't to powerful. However in large numbers they may be able to wound several goblins. Either way, it helps to reduce clutter in the animal stockpile while at the same time helping to kill goblins, so I see no downside to this.
Despite the infamy Townbrush has gathered among the Dwarves, only one has actually perished in recent times. And that was because he was a moody dwarf that refused all our materials, despite it seeming like we had what he required. The only other thing worth noting is the Forgotten Beast issue. Many Forgotten Beast's have taken up residence in the caverns, though few have attacked. Most of them are just endlessly wandering through the flooded halls of the Fortress. Since these areas are currently inaccessible they pose no threat. However, these areas are slowly starting to drain. And as flood levels subside, I'm sure the beasts will head towards the fort. I just have to be ready for that.
EDIT: My brave Flesh Ball explorer that I flushed into the ocean years ago was killed by a zombie sea serpent. By this point I thought it was invincible. I'm a bit saddened by that.