Mastercard might adopt crypto,but that doesn't necessarily mean that they will adopt Bitcoin.
They might decide to adopt some altcoin or token.They might create their own "mastercardcoin".

I couldn't care less about this kind of adoption.
If that news is real, we may see a good thing will happen to the crypto as Mastercard has many customers interested in the crypto. It could attract their attention to invest in crypto or just buy and sell the crypto using their card in the exchanges, which can boost the crypto popularity. With Visa and now Mastercard, that can help the crypto get more users involved in crypto and hopefully, that can lift the price to increase.
The news about Mastercard might sound bullish for the crypto industry,but I'm very cautious about such news.Last year,everyone was excited about Paypal becoming crypto friendly,but the whole Paypal adoption was just a gimmick designed to fool the cryptocurrency enthusiasts.Paypal isn't crypto friendly and it never will be.Nobody can withdraw any cryptocurrencies from his/her Paypal account.
If the Mastercard crypto adoption looks like the Paypal crypto adoption,then I'm not that enthusiastic about it..