I think it's important to differentiate between the potential of crypto-currencies as currency, and the technology that powers them - the blockchain. I think th

I think it's important to differentiate between the potential of crypto-currencies as currency, and the technology that powers them - the blockchain. I think the blockchain has a huge potential to revolutionize many industries. Whether crypto-currencies like Bitcoin actual take off as real currencies is less certain and may have some negative effects. But whatever happens, the blockchain itself (and presumably ether that powers the smart contracts) will be around for a long time.