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The 21 million doesn't mean much really. The decimal point can be moved around. You would still need to go through a middle man to exchange btc to local currency for remittances. How exactly is btc going to lift the third world out of poverty? Many btc holders have already fallen victim to theft, and many more will in the future. People of the world won't suddenly turn to btc in the face of economic collapse.
wrong, theres no need of middlesman to exchange btc to local currency through platforms like localbitcoin.com.
additionaly when bitcoin archieves mass adoption then there wont be any need to exchange btc to fiat anymore.
alot of people in the the third world have no access to a financial/banking system. what would happen if they get access to bitcoin?
That's slightly incorrect, localbitcoins itself is a middleman - there will always be a need for escrow services in the bitcoin community, at least until the foreseeable future. Of course, there is a far lower need for middlemen in bitcoin than any other transaction system/currency.