This is an interesting perspective, and one that I hadn't considered. The obvious implication is that Bitcoin should only be used where one currently uses cash.

This is an interesting perspective, and one that I hadn't considered. The obvious implication is that Bitcoin should only be used where one currently uses cash. Crucially, this means 100% offline (because even bank transfers require a bank, which Bitcoin doesn't have). Perhaps the route to success for Bitcoin involves sophisticated offline tools?