I believe your concern is right but blockchain is also a new and useful technology in some aspects. The main feature about blockchain technology is about the cryptography, how the technology helps secure the transactions, data, record keeping or security. The technology is not mature yet while it may not be applicable to all the applications or service sectors too. The decentralised network is an alternative way in transactions or other actions other than the centralised.
We should not limit block chain technology to crypto currencies only. Blockchain is a vast technology and can be applied to many fields of life. The best thing is that it is decentralized and we can use power of distribution rather than limited centralization.
Right, the issue for most newbies in this crypto sphere is that they think that this technology is for crypto only. There's a lot of usage, like in banks or other industries. So this technology is a must and companies or industries will just have to tailor fit the ledger for their usage and used the power of this technology.