Let us keep in mind that PayPal's annual payment volume from 2012 to 2015 keeps on increasing (from $150 billion in 2012 to $280 billion in 2015). That in my opinion is a hard act to follow. But I believe that in the future, say 10 years from now, we might be talking about it differently. Right now, bitcoin's market cap is at around $15 billion (having already reached all-time high) compared to that of Paypal's which is at $50 billion.
Paypal was a business venture that had a lot of investments riding on it. It came amidst a slew of other payment processors who are also doing more and more business each year. It's taken them a long time to get to that stage, and it will probably take a lot longer for bitcoin... which is not a business entity.
Bitcoin doesn't have any advertising or financial muscle to flex - it's completely reliant on us, the decentralised community.
Let's see where bitcoin is in 2020 =)