I ask myself more if centralization is even a problem. I like Erick Voskuils logic, if miners start censoring transactions they are leaving money on the table (transaction fees), encouraging someone in a xyz country to spin up a mining operation and mine those transactions. So in the long term I believe there is a genious self balancing mechanism at play here. Its just theory though, we didn't see a proper attack yet. At the same time, why would miners (even if heavily centralized) hurt their investment by hurting bitcoin in any way (censoring, printing more...et)...