To ensure some sort of centralisation never happen, the best way is still to spread the hashrate concentration to multiple new pools. I guess since there is more and more people coming into the game, and a lot more will come I think because of the price rise, actions will never have to be taken.
Blockchain, the technology underpinning it, cannot be centralized. Bitcoin in a way already is. Centralized exchanges are how 99% of people trade their cryptocurrency, and they can be forced to accept regulation or be shut down. The only way to truly and permanently decentralize Bitcoin is by setting up decentralized marketplaces
and it is already being done
