Cardano's sustainability lead, Alexandre Maaza, suggests that decentralized identity (ID) solutions could be the next big thing to attract mainstream blockchain adopters. He believes that the blockchain sector still lacks robust use cases, but decentralized ID solutions could be the "killer" application to draw in millions of new users. These Web3 decentralized IDs are privacy-oriented, allowing users to provide only the necessary information for verification, and can be withdrawn at any time. Maaza also highlighted that a non-speculative use case is needed to bring blockchain technology to the forefront.