The most known and used feature of bitcoin is its decentralized market which is also the reason why the people have supported and used it since then so it would be really hard to convert and make it as an centralized coin. Bitcoin was mainly used by the people to avoid the taxes that is being thrown by the goverment to their purchases and transactions and also gives them anonimity but somehow abused by some and uses it in illegal ways instead. I think that the bitcoin itself cant really stand being centralized since the people have supported it because it allows them to make theirself hidden and it could also result to bitcoins downfall.
I know that centralization is bad for Bitcoin, but it seems to be heading that way, unfortunately. Considering the huge mining pool dominance in the network's hashrate, the upcoming Lightning Network, the established futures market, and more, are all signs that Bitcoin is heading towards being manipulated by the middleman. But, that was not the real purpose of Satoshi, since he/she/they wanted to create Bitcoin free from central control.
Since most people depend on centralized exchanges, and other centralized services, they're heading back to the middleman. A truly decentralized cryptocurrency would be only traded in decentralized exchanges, it's mining process would become accesible by an average person, and it would scale on-chain without the need to trust a third party (unlike the Lightning Network). Therefore, like it or not, good things come to an end, and I think that if Bitcoin started as a decentralized cryptocurrency, then it will end as a centralized one controlled by a few players (like Bitmain, Blockstream, etc).