Yes it is a very good move to add more fiat currencies, this is because it will bring more exposure to the crypto space as people in those countries can now buy crypto with their fiat as well as selling to fiat; what I think Binance is doing with such move is to make cryptocurrencies to be at our disposal thus being traded the way we want. Also, Binance crashing because of overload shows that the number of users is increasing rapidly which I think can be attributed to the more addition of fiat currencies to its exchange.