One of the fundamental parts of paypal is the ease in which a transaction can be reversed if the customer is not pleased. Bitcoin transactions are irreversable. Many websites that currently accept paypal may be cautious about this. So that means Paypal will have to take the heat if something goes wrong in a transaction. Something I don't see happening.
Yeah that is very true. The irreversible nature of bitcoin would change how Paypal currently operates with the ability to dispute transactions. Could definitely be a concern for websites such as ebay where you are purchasing products from someone want a guarantee that you get what you paid for.