I love the idea behind blockchains and smart contracts, but:

1) I don't think smart contracts should be programmed in JavaScript,

2) it would be better if smart contracts were actually treated as law,

3) most problems that are currently being hyped/solved with blockchain would better be solved with a public signed git repository, and

4) blockchains, as currently implemented, are immensely wasteful (I'm hoping this changes with more research).