It can never be destroyed you need the blackchain for the mean reason is, you have to understand what blackchain is,in about 10years has been invented blackchain has already done so many things so it can never been easily destroyed it have a big role in bitcoin it's served as public transaction ledger of crypto currency it is invented for bitcoin made it as first digital currency to solve the double spending problem without need of a trusted authority or central server it is also inspired other applications so how can be blockchain system be destroyed if it has played a biggest part of the market right now.