These are market problems that are especially suited for developing nations to be able to solve themselves. I am forever impressed by the ability of local populations to work out collective solutions to scaling and trust problems.

Also, having options is better than not having them. Sure, there's the international wire system, but it wouldn't hurt to give it some competition.

I'm not saying cryptocurrencies shouldn't exist, only that they are not at this time a serious or practical alternative except for very unique scenarios that are generally outside the scope of the average citizen, especially in the developing world. In the developing world, very often, even access to computers, electricity, and internet are serious obstacles, not to mention a gap in technical literacy compared to the developed world.

Didn't developing nations already solve this with hawala?

>difficulty because recipients need to be able to convert ? bitcoin into spendable money which often involves risky in-person meetups and gigantic markups on the conversion rate.

One day there will be no need to convert to fiat.

Unlikely, but even if true, it still needs to be converted today and into the foreseeable future.