If one manufacturer makes the majority of the asic miners what will prevent them from building in a backdoor to remotely control all there miners? Therefore hijacking the network and forcing concensus as they will.
Bitcoin core is a small group of developers that dictate the future functions.
Both these makes my worried that bitcoin is not decentralized at all but it is merely an illusion.
jes it is,
its not just an illusion its a fact, you can observe. the delussion bitcoin is decentral is currently just used for marketing purposes.
people however will get used to centralised cryptocurrencies.
the question will then be what are those people that control that cryptocurrency doing. what are the people supporting by accepting that particular cryptocurrency with their work
and in the case of bitcoin it would be just the waste of ressources. thats not a good image to be accepted globally either in the environmental consciousness west, or the poor developing world they all will then oppose bitcoin for its character.
bitcoin will lose its current impression that its humanist, and only serves noble goals. however it was once helping those. but later it will lose them.