Well keep in mind they had to run it for the investigation. Regardless of whether or not the ride ever reopens - the state was requring those parts of the ride to be rebuilt (under supervision) and the ride to be tested. Once testing is over the state can decide whether or not it is safe, the insurance companies can decide whether or not it is insurable, and Cedar Fair can decide whether or not to open it. I think it would reopen if they got green lights from both the insurance companies and the state.
I certainly hope Son of Beast reopens. It is such an awesome ride - and I find Kings Island quite lacking without it...