These are good things to be concerned about. There's a second client and a second validator in the works, there's some stats on datacenter decentralisation in the youtube link above https://www.youtube.com/watch?v=5NDs3Il2J3Q&t=303s - 230 datacenters, 9% in a single data center. But yes lots of work to be done - I don't want to pretend there isn't - but also don't want to pretend that a network with far less activity has has already done it.