Paypal is a worldwide payment method, Bitcoin isn't yet. I don't BTC think it'll go further than it already go. There are so many other currency that intend to be what Paypal is at this moment, e.g., Utrust and Monetha. Nonotheless, I don't believe in neither. Perhaps, my mind is blocked by what i'm seeing already. Paypal domaining over the world. To take control over it, needs scalability, speedy transactions and confiability.
yeah moreover users prefer to use bitcoin for investment rather than use as currency, agree to get overcome paypal need something bigger than paypal while bitcoin for as its own currency still very far in appeal paypal, bitcoin transaction quite slow because of long time confirmation, transaction fee in bitcoin is very expensive, different with paypal which has instant transaction and fee is pretty cheap, so bitcoin can not exceed paypal #IMO
Comparing the number of users of PayPal and bitcoin currently, Paypal has more number of users than bitcoin and Paypal is used by worldwide for online payments, so it is clear that Paypal has more number of users and it is challenging for bitcoin to overcome Paypal.