If you can't trust or enforce gold, why do you imagine you can trust & enforce shipments of oil, or grain, or manufactured goods?

This is my point - there isn't really anything special about gold (except for uniformity and durability which make it an excellent money but don't somehow predispose it to theft)

Either we develop enough trust to conduct remote trade in physical goods, in which case we don't need Bitcoin

Or we fail to develop that trust in which case we also don't need Bitcoin