Ethereum Q&A: "Blockchain All the things"

Can blockchains help IoT security issues? Should we use ERC-20 token to trade solar energy? Can blockchains help with securities and prediction markets? Transport and logistics projects? Supply chain? Vehicular communications? Digital identities? Voting and election processes? Since there is such a proliferation of tokens, when will they reach the implementation stage? Ideas are cheap. Without ethics, tech can be dangerous.