Just running through some plans for the future development of this proposed idea from last May, and it occurs to me that limiting the attrition damage to people is a big damn mistake. After all, it is not only people that fall and break and get damaged and cease functioning when a party staggers their way through a forbidding landscape. So does their stuff. Picks break from use, tents tear from winds, handles snap, gourds split and so on. In the bigger picture, the hulls of boats and the axles from wagons stress steadily over time and with heavy use, until they too give out.
The boat that sits in the harbour, even in a storm, does not do the work of a boat that beats the waves for months at a time. Yet when have you ever seen a ship damage table that didn't involve a storm or a battle? Do you not think the crew is kept busy steadily repairing ropes and sails, and not just from the last gale?
So what is needed is a clear structure on how hit point damage to characters is marked side-by-side with damage to their goods and equipment, from pots to sandle-straps ... and then what is needed is a rational, convenient method of maintaining that damage which is as easy to effect as returning lost hit points.
I don't have it, but this is one of those posts where I declare the problem, and then I go away and think about it.