Did we ever consider what Satoshi insinuated by "cash"?
...
It makes sense considering his design of the system that Bitcoin can not ever reach the ubiquity of cash in transactions worldwide. This would necessitate such as scale as to effectively centralize Bitcoin and therefore defeats the original attempt to remove trust
.
Perhaps not as ubiquitous as cash transactions worldwide, but it is crystal clear from the 3rd sentence in the Introduction of the Bitcoin white paper that Satoshi expected Bitcoin to be
more useful for small casual online transactions than Visa, PayPal, etc:
