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.
Bitcoin becoming centralized sometime in the future has a high possibility. Becoming Centralized takes time and it cannot happen in just a snap of your fingers so when we give time to bitcoin to become centralized it can come true later on