Facebook's coin is postponed not dead. Their big problem was that they tried to grab too much power at one time. Having a company create a currency gives it too much power. Think about a company that has billions of users and they all would be forced to use FB's currency. Eventually it would be it's own country with all the power that goes with that. Politicly, no country is going to easily accept that.

Now think about a currency that's used internally and slowly it gets released by the company and used by all. By the time people started fighting against it it would be too late to stop.