It doesn't solve the centralization issue though since it becomes increasingly difficult to run a full 'archive node' over time. I suspect it would take months

It doesn't solve the centralization issue though since it becomes increasingly difficult to run a full 'archive node' over time. I suspect it would take months to sync a full node from scratch today. That barrier is too high to be called decentralized. You end up having to restore from snapshots and that involves trust.