That's very true, but providing infrastructures for crypto currency adoption will be cheaper than the present system of payment, I say this because of the following;
1. Private companies can set up internet infrastructures when given the chance by government to do so.
2. Crypto currency payment system can be handled anywhere by any individual with going to a banking hall, so government or countries do need to bother about building banking halls.
3. Crypto currency payment system don't need much control or government involvement to work properly.
The only thing preventing crypto currency use is the unwillingness by the different governments.