[randomswede]

My (very rough) estimate is that somewhere between 1% and 5% of those who enthuse about crypto-currencies are actually interested in the underlying tech. The rest being in it for one of "it's a safe way to do nefarious economy" and/or "it's easy money".

Me? I think the tech is intellectually interesting, but doesn't really scale to the point where it can provide a "world economy". If nothing else, with Proof-of-Work, you need 51% of ALL available computing resources dedicated to maintaining the chain, which is an incredible waste (if you don't have a majority of all available computing power, the chain is vulnerable). With Proof-of-Stake, you need a majority of the economic system dedicated to just maintaining the economic system.

So, intellectually interesting, but practically useless.