What i guess isnt the question,but who is stoppling trying to block bitcoin.Companies like paypal,visa and mastercard has a lot to loose if bitcoin gets everywhere,they will loose their costumers very fast,a huge part of them not all,as the oldest may not dropp them.Soo they are in a buble trying to keep and make bitcoin unknow to the most,but well the buble is getting bigger,soo the way to fight is attack saying its is a good thing to black market and many others things,rumors to make bitcoin not grow.
Why cannot visa or paypal integrate bitcoin into their payment system? Bitcoin is just another kind of money. It can be used cheaply by the credit companies.
They could but they would lose their fees they get from the payment channels they use at the moment. There is always some kind of charge for using them even if it's hidden. If you buy an item on ebay that's priced in a different currency to your country's they charge for the currency conversion. They couldn't do that if they integrated bitcoin into their payment system.