I'll start recording the odds and see if I think they are bad.
The world running out of a resource is not an impossibility however. Remember, you are playing on an alternate planet, with an alternate timeline, with alternate amounts of resources. An Iron-less game would be more difficult for all players and definitely change things up, yes?![]()
Except that Iron is the 6th most abundant element in the universe so will be abundant everywhere. It would be a very odd and unlikely planet that would ever run out of it. Especially given that it is also incredibly recyclable.
Though yes in the game it would make for an interesting time. Although if any civ got found iron in a random mine they would have a mighty big advantage.