The future structure of these Blockchains will link Dynamically for single users and entire Clouds, providing total veracity to any single entity that requires relevant, on-demand access to information: A relational database composed of smart contract linked Blockchains.
I view this as the most encompassing solution providing a full array of choices: Decentralized/Centralized, Distributed/Consolidated, Structured and Unstructured within a system. The Blockchain may not provide over-all efficiency within the cluster, but it provides Redundancy, Speed and Security to those using this particular structure. A relevant example would be Apache Cassandra. This database has the Highest Response, Best Availability/Redundancy of any database, this is the model I believe is necessary for effective decision making for any entity.
for example, Think of a Financial Blockchain linking transactions to a Scientific one that proof checks scientific theorems. The Bitcoin Blockchain would make a transaction that would purchase a set amount of work from the Research Blockchain, linking the said transactions with cross referenced information detailing the contract. Those who would be interested in full-filling the contract would simply begin supporting their respective Blockchain to earn funds. In effect we are creating autonomous bounty boards capable of requesting and full-filling different work, giving the machine the power of Finance.
Now imagine this 1000 fold, Blockchain referencing Blockchain upon Blockchain in complex relational 3d Matrix type arrays... dynamically linking each other to the physical world with real effects. A single person could download all the Blockchains across the planet and know all relevant information across the globe to a fine degree, giving them the power to datamine all known knowledge for effective decision making in a decentralized global fashion. That is Intelligence.
And if privacy and security is a problem you should check out Bitmessage; 512 bit security in every message, it's going to be tough to hack... and that's not even the most bad-ass solution, there are blockchains capable of orwellian levels of security; NXT, that thing is a beast!
Another example would be StorJ. This service provides data storage in an automated decentralized fashion that supports the community, in effect community memory storage, as long as someone cares for it, it'll be remembered.