Can anyone think of any use cases for smart block chains that has any wide adoption potential

So far, I can't think of any killer app that is enabled by smart block chains.
An OpenBazaar market place? Do we need a smart block chain for that?
It will enable touring complete and fully automated ponzis. It will be a new era for pyramid schemes.
The everyday person does not have demand for smart contracts actually. It's a tool for scammers and a toy for geeks. Nothing else.
No banker or businessman in their right mind would run contracts on that chain for financial purposes.