I agree. The argument of the "unbankable" poor in 3rd or 4th world situations having access to the technology that allow for this decentralized currency is a LONG way off. And quite frankly, the poor would most likely be better off with a WORKING centralised system with its checks and balances(flawed as it may be).
There are 1.5 billion smartphones being manufactured every year. It is not going to be long before every one has access to a second hand one. Bitcoin transaction fee is too high but another crypto will come along that will have no fees. IOTA, which is meant for machines, uses a tangle and not a blockchain and has no fees.