Sure, paypal is the big kid on the block right now, but who's to say they won't start accepting bitcoin as one of many international currencies?
(Edit: I just added "after 5 years" and "never" as additional poll choices.)
Why would they?
Paypal will loose a lot of revenue if they start accepting Bitcoin. They cannot charge such a hefty 3 percent for Fiat conversion as people would prefer alternate option.
There are many startups that are already working on products like paypal using Cryptocurrency. By next year you might be using their services at Amazon or other online retailers. Why would then Paypal enter such a competetive market?
My answer is never.