Bitcoin in no case should be centralized, and by its nature it is designed in such a way that it is almost impossible to centralize it. There will be a lot of different forks of bitcoin, which, for sure, will try to cetralize to reduce. its volatility. It's hard to say what will happen, but it will be another bitcoin. The present needs to be improved, but it is by no means impossible to change its nature. Even if it eventually loses functionality. He will find his admirers and with minimal technical characteristics. There is also a demand for antique cars and other old things and items.
That's certainly true, mate. I believe there should be no reason to centralize Bitcoin, as it would totally defeat the whole purpose of a blockchain. Even if this were to happen, users would fork the Bitcoin blockchain into a decentralized one, separating themselves from the main chain's decentralization. It's like true democracy where you get to vote on what's best for the cryptocurrency's network. As such, Bitcoin may remain a decentralized cryptocurrency after all.
There's a lot of interest from people in the mainstream world, into keeping Bitcoin as decentralized as possible to help it succeed for the long term. While big mining pools pose a threat to Bitcoin's decentralization nowadays, I'm sure that there are already solutions being worked to help Bitcoin become more decentralized over time. However, only time will tell us for sure, what lies ahead for the future of Bitcoin and other cryptocurrencies. Just my thoughts