Bitcoin has the potential to meet at least some of these challenges more quickly and at less cost than any other tool currently available.
The poorer have less of a cushion to weather adverse changes in the purchasing power of bitcoins held. This doesn't mean Bitcoin still won't work, it just means they'll probably want to use a payment processor who stores value in some unit that is less volatile.
What I'ld like to see is something like Bridgewalker app in which the funds are not just USD but instead a basket of commodities suited for the type of future buying an individual might encounter. For instance, if a quarter of my spending is on food, another quarter on gas, and maybe some materials like cotton then I might want a basket that has 25% of the value in agricultural commodities (meats and grains), a 25% in energy (e.g., crude oil), and then some in soft commodities (cotton, lumber, etc.) with the remainder in precious metals, etc.
That way you have low volatility for your store of value but the actual exchange is in bitcoins so you gain the benefit of that being a low cost, low friction payment method. (i.e., the recipient doesn't need to know you were using something like Bridgewalker as you paid in bitcoins.)
Here's the link to Bridgewalker:
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https://www.bridgewalkerapp.com