Clarification update:
Centralization is a problem - In other words, the node count is going down and the mining is centralized via a few pools (China being the one with most hashrate). (bad) Example of centralization causing problems - Nodes are impossible to run on average hardware; i.e. they need a data center (might as well use Google). Decentralization is one of the main feats of Bitcoin. Rhetorical question: Would you feel comfortable if the whole network was running on Amazon and Google cloud services?
By data center you mean this?
https://bitseed.org/I understand what you mean but I think this fear is overblown. There is an incentives for individuals, businesses and miners to run full nodes at the lowest price possible so the market will come up with cheap solutions.