Even history is evident every society faced it's dark age not due to lack of resources but because those resources were only utilised by and for a selected few. Democracy was supposed to be a solution but eventually paid media came. In the age of IT open source was supposed to solve it but their to people develop their own software based over those dependency which eventually lead to empowerment of few.
But this can't happen in blockchain cause by default they are supposed to be open source, so it means anyone can have the contribute to a project help in development or if they like even give it a particular direction. Still there are coins like Stellar(XLM) and Ripple(XMR) which somehow had proprietary software in them. So would it still might be a possibility that we might see centralisation of decentralisation in future?
On paper, the odds greatly favor centralized blockchains. However, there will always be a few that are decentralized. The few that survive and withstand will slowly but surely scoop up the mass network effects over time making centralized chains either irrelevant or turned into covenant gateways for people to use in between web 3. So web 2 bridges taking you to web 3 lands.