1. All crypto will be cracked eventually, it is just a matter of time. First we have key length requirements increase over time:
http://www.keylength.com/en/compare/2. Next we have IBM's head of research for quantum computing (with a $3 billion budget) expecting that quantum computing will arrive in 10 - 15 years. All the crypto-currencies to date use crypto that can be cracked with a sufficiently powerful quantum computer. May not happen in 10 years, but eventually it will.
Maybe if there is a way to re-encrypt the whole blockchain with a stronger encryption over time, past anonymity is not endangered by computational advances. Just an idea that flew in my mind.
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