>Cash payouts are made out of necessity. The majority of international remittance recipiants don't have bank accounts, and the cash they receive from their emmigrant relatives goes to immediate consumption needs

Are (US) dollar bills a workable substitute for pesos at the receiving end? I mean, can a rural Mexican without a bank account buy what he or she needs with dollars? Or does her or she need pesos?

(Not rhetorical: I really don't know.)

In other words, sure, I understand that BTC are not useful in rural Mexico because many have not heard of them, and most who have heard of them do not trust them, but surely everyone in Mexico knows that US dollar bills retain their value.