Two points, first if you abandon the system for something else then you have to solve all the original problems again making the first system more or less useless. Second, even just 2 transactions / month * ~7 billion people is a lot of data.
PS: USD actually operate on a 3 tiered system that works well (Fed, Banks, cash) but doing the same thing in a *coin seems like just giving up.
PS: USD actually operate on a 3 tiered system that works well (Fed, Banks, cash) but doing the same thing in a *coin seems like just giving up.