i personally think bitcoin will overcome Paypal, less fee to pay and no chargeback. Paypal already a well established company but there's a lot of issues and they are not even bother to solve these problems. they will decline and will be gone in 10-20 years
actually bitcoin is a universal currency and it can be use for payment method anywhere in the world. while paypal service is limited and they cannot provide their service throughout the world.
Paypal is working in most of the countries expect few due to government policies. But they are best for buyers because they protect buyers from scammers, so they have become so popular in an online payment system. I do agree that bitcoins you can send to anyone in the world, but you must need an escrow to deal with unknown person otherwise, you may get cheated, and that's the drawback for bitcoin transactions.