Mastercard feeling unsecure of them well stabilised business for Bit coin full systems they never did faces ever until now in them economical territory. Suddenly when they can see other someone entered and doing better than them in the world economical networking systems then them headaches started and for that they decided to attack bit coin and trying to manipulation peoples for keeping far from BTC. I don't think Mastercard can be successful about attack on BTC systems.
What makes you think Bitcoin is doing better than them? Lets be realistic, Bitcoin is a blip on the radar compared to the amount of transactions they process. There are rampant issues of merchants accepting and then dropping Bitcoin payments because nobody is using it with them, but not the case with credit cards.
It was also proven by the recent stress test one could effectively clog up the network for a single day for about $5,000 in transaction fees, these guys could destroy Bitcoin without blinking by clogging up the network for a month very easily.