#Bitcoin has become second largest ETF Commodity in the US, no danger of Centralization because of that. But there is danger of been Centralized because of Mining Pools and no development on Mining Hardware.
Discussion
mining centralization is not a real problem . miners can switch pool very fast and actual hardware producers are doin a very good job or else more producers will join to take their cake share.
Pools tend to be large firms lately, as for hardware of course there is, but not for the home user, if we want to decentralize mining we need the home user and 0% fees.