Bejaymac carts already go abandoned if the owner doesnt log in.
All those carts that you see that say 4000 days, would be claimed by active tribe leaders that are keeping the totem refreshed, so they wouldnt be removed.
Bejaymac, you make a great point though, I think they should remove decay on anything. Because think about it say I'm out hunting and my axe breaks. What would I do? I would have to go wandering over half of the map looking at trade totems.
HAHA, its a no brainer that items (including carts) should decay. Walls, buildings, baskets, floors, carts, weapons, armor, etc. Everything should decay either from use or being worn away.