I've become skeptical about bitcoin for remittances. The biggest cost in remittance architecture isn't the electronic transfer, but distributing cash. Western Union, e.g., maintains a network of over 1 million agents - banks, post offices, dry goods stores, mobile top-up kiosks, etc. - so that recipients, often in rural areas, can collect their cash. Bitcoin does nothing to reduce these costs.

(Unless you're assuming recipients in Africa et al. will keep their money in bitcoin, which is ridiculous at this point, and will be for many, many years.)