OO and game design questions

[dex]

> I'm not sure if it's a good idea to let an item disappear from your
> inventory by a weak reference disappearing.  It seems a little shaky
> to not know where your objects are being referenced, but that's yout
> decision.

OK, imagine a MUD, where players can "dig out" new rooms. Room A has a
door that holds reference to newly created room B. By "using" a door,
player is transported to room B. At later time someone destroys room
B.

Using strong references, I have to remove room B from list of rooms,
and also remove door to room B, as it holds reference to room B. To do
that, I have to keep list of doors that lead to room B.

Using weak references, I don't have to worry about removing all doors
to room B. They all now have a dead reference, which better models
actual situation. If part of mine collapses, or if a module on space
station is destroyed, the passage to that location does not magically
vanish - it's just obstructed.

Can you please tell me if there's something wrong with my reasoning?