I think the biggest selling point of this idea would be the globalization. Even tough it is really difficult not to invest into anything worldwide when you have a lot of money, it is quite difficult to invest into stuff when you have just couple thousand dollars.

Someone from France investing into USA stocks at about 100-200 dollars capital would have a lot of hard time finding the right place to do so. With this technology just like how we managed to find a way to send each other 5 dollars for couple of cents transaction fee, it will be same for stocks, someone from south Africa sending 5 dollars to someone in Australia is incredibly easy in crypto whereas quite difficult in traditional systems.

Same applies here in stocks, someone from South Africa to buy stocks of an Australian company is quite hard right now, at least hard if you are not spending 25 thousand dollars, this way you can spend 25 dollars and get 3 stocks of an Australian company easily. Crypto and blockchain just makes globalization incredibly easy.