Put thrice-come ruin on dungeon bosses with a 30s falloff, 3 strikes and you are out. Cant get healed out of doom.

The newest dungeon from MSQ kinda has that element with a straight up doom debuff, but I feel like 1 strike and out is a bit unfair (altough you can esuna it on the dungeon)

As for the rotation part, I assume adding minor DPS checks that reward the players could be a nice plus. Do great damage?, the boss says "I am impressed" as they die and drop an aditional chest with materia/more gear, or chance for another minion drop, or a buff that lasts untill the next boss, etc.

As long as you put a carrot on a stick, people will try to get it. And only the worst of the worst will go "i cant be bothered to try harder for the prize"