The idea of smart contracts seems interesting, but the current implementations are far from perfect. Surely, a contract cannot replace a lawyer, because when there are grounds for disputes, we need someone or something that is able to process arguments and context. However, they can replace escrows. I used a smart contract only once on some sport betting website. It was harder than I expected. I had to use Metamask, transfer my money first to a 'wallet' there and then to the casino.. I won, but I didn't see my funds in the Metamask or MEW wallet after that. Other members also reported that issue, but the casino provided a link that was proving that the payments were sent out automatically by the contract.. The bet was worth a couple of dollars, so I didn't bother looking into details and determinng why I couldn't get the money, but the whole thing was complicated and not worth it. If someone manages to make smart contracts really user-friendly, they will become more popular. For now good old trust system with humans seems more convenient.