We already have the ability to create our own marketplace with OpenBazaar, that uses Bitcoin as its payment method, so it should be no surprise that the combination of these two may be a fierce competition for both eBay and Paypal.
Nevertheless, feel free to vote on the poll above and express your opinion about it, if desired.
In my own opinion, Bitcoin will never overcome paypal and why? , Because paypal was created for people to get their payment online and it was being used usually by those people who are freelancers and wants to work at home.
Paypal is a centralized company and they work for themselves only. Bitcoin is different, it works in a way for the favor of the community and the users. This is the main difference between them. Bitcoin will be more advantageous over paypal soon.