Yeah i think i am slightly masochistic. Maybe even extremely masochistic (I play Götterdämmerung on VH and even enjoy it
).
I would say no victory conditions needed because if there are left only 2-3 players normally if a player sees that he loses he resigns anyway after getting a few turns of beating.
I resigned in my last game also when my nasty enemy slowly killed down my clammules. I would have been able to resist him for 30-40 more turns probably but it would have been in vain because i was not growing, rather losing resources each turn while he was growing and growing.
So i think if there are left 2-3 players after 10-20 turns of heavy fighting the winner will be rather clear and though he would need another 20-30 turns to win normally the opponents surrender until they are EXTREMELY masochistic.