I've read an article about Bitcoin centralization and I was really surprised. I couldn't believe it was possible. Now I know for sure it is possible even with a decentralized crypto, but I'm not sure about the future. Anything could happen, you know...
After centralization, bitcoin has no meaning. Without decentralization, you can block other people's transactions inside the network. When exchanging a certain purse of bitcoins for fiat currencies on the card, it will be possible to track the electronic trail of a person, and then attach its data to the bitcoin wallet. So we lose our anonymity.