One character can only make use of a finite number of items at a time: a shield, a weapon, and a tool, machine, or vehicle. Since most characters don't try to amass things they can't actually use, the total amount of 'stuff' desired is some relatively small multiple of the number of characters. Since one character using maximum mechanization can produce all of this (except maybe a car) in a cantr year or two, it is not farfetched to imagine that there will soon be far more productive capacity than there is use for it. At this point, any companies that don't shut down will be running on pure momentum, with no real incentive to gather or grow...
If they never go away, sabres may come to outnumber living characters... the end would not be long in coming.
