Ok, Winter 244 and after 6 months, it would appear the tantrum spiral has gracefully died out.
The killings slowly petered out. Final tally is 29 dead, 14 resting (most with red wounds, including Morul's wife). Fortress population is down to 49 from a high of 78. That leaves 27 dwarves to run the fortress - 4 children, 14 bedridden, 4 champions as non-laborers. That should be just fine - there's a ton of rebuilding to do - wrecked doors, beds, cabinets, coffers. They destroyed a magma pump and the magma has just evaporated enough to repair it. Workshops have been destroyed as well.
I have 4 legendary miner, mason, engravers left - some in bed, some not. 1 woodcutter, carpenter left - also in bed. I have one legendary weaponsmith left (also in bed) but the armorsmith got killed. Most of the rest are wood/stone/bone crafters, and some assorted food folks. No legendary brewers or cooks - they're dead. One legendary glassmaker. It's workable, particularly once everyone is healed up. There's 6,000 booze and 5,000 prepared meals, and Morul can defend against anything that might show up, so we should be good from here.
I've upped the orcs to size 9, damblock 7, and Morul handled 5 squads without a problem. He gets tired after 1-2 squads and needs to pause for a few days and then is ready for the next set. I'll probably go up to 9/9 and see how that works out. He still sends them flying with his silver hammer (he's grand master hammerdwarf now), but not as far as in the past - 40 tiles or so at most, and not as often.
The biggest casualty is the magma pipe moat. Not enough guys to keep the pumps manned 24/7 to allow miners in there. Maybe once everyone is healed up.