I think the SC already has a tough enough workload as it is. If we made them review every single law, then they would just do a half-assed job in both their traditional role and their new role.
Perhaps, but isn't the current workload in some cases the result of not reviewing new laws. So with a system of reviewing new laws before their passage it seems likely that what makes up the court's current workload would decrease over time.
It might be an incentive to pass fewer laws, or ones that aren't so long.
Prohibiting riders would be a better start there, for my money.