a16z Crypto has downplayed the immediate threat of quantum computers capable of breaking cryptocurrencies, suggesting such technology is unlikely to emerge before 2030. The firm highlighted that while quantum-resistant cryptography is necessary to counter potential 'harvest now, decrypt later' attacks, premature migration could introduce new risks like performance issues and code vulnerabilities. The firm noted that most non-private blockchains, such as Bitcoin and Ethereum, are not immediately threatened by quantum risks due to their reliance on digital signatures. However, privacy-focused blockchains should consider transitioning sooner to protect confidentiality. a16z stressed that current security threats, including code vulnerabilities and side-channel attacks, are more urgent, urging developers to focus on code audits and testing.