Quantum computing is unlikely to completely replace classical digital computing. While quantum computers excel at solving specific types of problems, they are not superior in all aspects. Quantum computers are well-suited for tasks like certain types of cryptography, optimization, and complex simulations. However, classical digital computers remain highly efficient for everyday computing tasks, general-purpose programming, and tasks that do not take advantage of quantum properties. It's more likely that quantum and classical computing will complement each other, each serving its unique strengths in various applications.