(Survey) Blockin' all over the world: Is Blockchain all it's cracked up to be?

Blockchain focused start-ups are springing up like mushrooms after the rain, and the big banks all seem to be investing in this space. But is this just a ‘fashion craze’ (loom bands, anyone?) and the big guys just want to show that they are technologically advanced and forward-looking, whilst the new guys want to cash in quick before the world moves on to the next big thing?