I'd also point out that there are a couple of projects out there aiming to add "blockchainish" behavior to a "regular" database without sacrificing the functionality we're all used to (try finding a tx with a specific value of the op_return on the bitcoin blockchain for example).
Any chance you can provide names or links to those projects? I've been expecting this, have even heard rumor IBM is building Paxos into DB2, but would love to see real projects.