I doubt you will find many that cannot live without a Blockchain system. Instead see it as a tradeoff between performance and where you place your trust. Centralized systems are performant, but the burden is managing the security/trust of that system. A decentralized system of trust removes this burden, but it comes with a performance penalty.

An example I'm working on right now is a system of authentication using Ethereum to replace passwords. The decentralized identity of addresses, combined with the cryptographic primitives provided, paves the way for a whole new way of managing identity and authentication even in the "old web" world. Hopefully I'll finish my demo by the end of the weekend.