If we could look at above chart on Paypal's payment transaction volume , then we could deduced that if that current rate of Paypal's volume continues its upward trajectory, then Bitcoin might have a hard time overtaking Paypal, not unless its volume will show a declining pattern over a period of several years which I doubt wouldn't happen. But, I think its still a possibility and that many things could happen within a period of ten years.
Journalist:Wes Messamore @thehuli
June 1, 2019
By CCN: Research by Chainalysis finds that only 1.3% of bitcoin transactions so far in 2019 came from merchants. The remaining 98.7% of volume is all on the exchanges.
That means almost no one is using bitcoin to buy things. The bitcoin economy is still mostly about speculation, not a global payments system. The figures are based on data from New York-based blockchain researcher Chainalysis Inc. and are based on the first four months of 2019.
In an email to Bloomberg, Kim Grauer, senior economist at Chainalysis, says:
“Bitcoin economic activity continues to be dominated by exchange trading. This suggests Bitcoin’s top use case remains speculative, and the mainstream use of Bitcoin for everyday purchases is not yet a reality.”
Source: https://www.statista.com/statistics/277841/paypals-total-payment-volume/
https://www.ccn.com/everyones-hodling-only-1-bitcoin-volume-merchants/