I think my reservations are directed more at bitcoin/altcoin than the blockchain in particular. I was pretty enthusiastic about altcoins and bitcoins back in 2013-2014 and kept a fairly active wallet for a time, but as bitcoin began to feel like a high-risk, unregulated futures market I started to back away. Some of the issues outlined by Mike Hearn at the beginning of this year decidedly put the chase to my enthusiasm https://medium.com/@octskyward/the-resolution-of-the-bitcoin-experiment-dabb30201f7#.jj5zxuupz