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But here's my take: 1. It hardly takes any time for a quantum computer to generate all possible key phrases and check which wallets have BTC/ETH. Whoever have the phrase owns the coin 2. Another issue with mining, it gets high computational efficiency to find the next hash and get rewarded defeating all existing miners. So half the BTC yet to be mined can be owned by the quantum computer 3. AES and RSA encryption fails with very high powered computers, they are easy to crack 4. Quantum computer can simulate multiple computers in the network, making them a high participating network. If they own 50% of the network, they win Currently quantum computers can only do one high performing task at a time. But this can change