Large datasets are best stored in a DHT. The business logic is hard to compress or divide once you get down to sequence dependent operations.
A large ledger can be distributed via DHT, but the interpretation of the ledger requires the active state.
The structure you describe for a block chain database records is different than how we organize it.
Alright, I'm more talking about the node itself that has to download the blockchain ledger. It's not manageable as one single blockchain ledger when it gets too big. That was my main issue. Thanks for the feedback and clarity.