My personal bet is that blockchains will be like XML: a technology that was going to be The FUTURE for a while, got put into a bunch of things...
That's an outstanding analogy, one I had not considered before, but certainly XML is far less..err...includable is perhaps the word(?)... into a software project then a blockchain-based datastore and verification would be, right?
Let's just hope a XSLT-like companion to the blockchain is never developed...