I heard that. As I've said before, people revere the PayPal mafia, but revile PayPal.
As it's been said by others here, this is certainly good for Stripe because more than a few Braintree customers will flock their way to avoid PayPal, but it also creates opportunities for other upstarts in this arena.
That being said, there is a certain amount of lock-in for these products, so while it's relatively easy for a business to transition their new users/payers from Braintree to Stripe/others, it's pretty painful to transition existing users/payers out of Braintree as all existing users would need to re-key their CC numbers and billing addresses.