If they can truly destroy it, they would have done it long before the price goes more than $100. Blockchain technology has offered more than the current system which is why Bitcoin becomes popular that they can't get it killed anymore. Its a simple store of value but BTC is just the first to come in mind when we talk of cryptocurrency because merchants accepts BTC.
the advantage of blockchain is that the system is connected to one another or decentralized, so it is very unlikely that the interconnected system is manipulated, because other systems will protect existing and interconnected data, blockchain technology is a very high leap for future payment systems , the financial world is experiencing a currency revolution, so the world should open itself to future technological advancements, bitcoin is the future currency or the parent of all crypto currencies.