[Mahn]

The original creator(s) just envisioned money designed to work in a digital medium. From there people derive that if Bitcoin is money for the internet it can replace PayPal, though in practice is more complex than that.

The reality is that as it stands now, Bitcoin is hard to understand and properly use, so even though it can be used as-is if you know well what you are doing and are careful, for Bitcoin to be usable for the vast majority of people a layer on top that makes it more consumer friendly is most likely necessary. Thus Bitcoin itself probably won't replace PayPal on its own, but a service that "consumerizes" it like Coinbase or Circle might, if Bitcoin were to become massive.