Well, those were nice words about Bitcoin coming from a big and popular online company called PayPal. I am sure that PayPal right now is feeling some heat due to Bitcoin and even if they know they have a captured market there are already many PayPal members who are using less of their service for many factors too long to mention here.
Now, having said those words above, should we be really careful with Bitcoin due to its speculative in nature and which can already be excessive akin to the dotcom bust many years ago? I don't have a large share of Bitcoin but it would be a shock to many if one day Bitcoin will just withered for reasons only time can tell.
He is just ex-COO. His words doesn't account for the PayPal company. This was his personal claim and he is quite right about it. I think if Bitcoin or other cryptocurrencies was to wither away. They wouldn't have survived so long. They have the potential of changing the world's traditional monetary system and thus acceptance is increasing with fast rate because of various benefits cryptocurrencies has to offer. I think the ony thing that can kill Bitcoin is another better form of monetary system than cryptocurrencies.
He is an ex-COO of paypal that is why he declared that this is also Paypal's vision, perhaps he knows this since he is former employee of the company, this is not his personal claim. But nevertheless, it is good to hear that Paypal want's to have a "the new world currency" and now bitcoin is fulfilling it for them. We really know what bitcoin can bring globally, thus we are taking baby steps to ensure that in the future, bitcoin will remain the dominant crypto in the market specially once mass adopted.