As a braintree customer, this deal does give me cause for worry since I jumped to Braintree because of paypal.
However realistically, since all of our production code is already completed and tested against Braintree, we are not going to switch unless they do something really dumb like close their api.
For me as long as Braintree continues:
+ Using their 'vault' for credit cards
+ Continues having a great api
+ Continues have great customer service.
I'm going to watch and see what happens.