And also, the banks make a ton of money using Swift. Even the Western Union and MoneyGrams of the world want to keep taking their huge cut. Even a new startup will have trouble getting traction in places where you can't exchange Ripple for fiat.
Add to all of this the fact that 60% of the tokens are held back. Who wants to take a large position in a currency when a single entity can flood the market anytime they want.