I don't see the need when we can leverage human trust/reputationand basic protocols for so much.

also, there are tons of smart contract solutions out there already. this is an alternative. plus a cheaper, simpler, more open and extednable protocol. If someone wanted to add a smart contract layer on top of this and repackage it as a new system, they could.

smart contracts imply barriers to entry and external dependencies. the world has enough of those already.