I love the idea of having a company similar to PayPal and using Bitcoin as the medium of payment. Is that the main idea of your post here? It is a little bit confusing actually so I am encouraging you to post more technical details. I had been with PayPal for many years before shifting to cryptocurrency.

PayPal had some issues which to these days are still unresolved. Maybe because they don't want to get entangled with the government, they became stricter than usual and this resulted into many online marketers leaving PayPal for good.

I am sure though that sooner or later, PayPal would incorporate cryptocurrency into their business model otherwise they would be losing more business value and may just fade away.