I believe that only way to ruin Bitcoin is by making fiat better money. That would mean that central banks and governments needs to stop printing money. That's very unlikely if looking at the last 4600 years of the history of money.
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Going too slow on post quantum is a great way to ruin Bitcoin. We already have the exact quantum algo that can destroy Bitcoin, it's just a matter of functional q-bits, and there are enough teams trying enough different approaches that a breakthrough in the next few years, while still shocking, would not be unimaginable. All the arguing is not helping, in my mind it's a 50/50 whether Bitcoin wins the race against quantum or not.
On the plus side, what a dramatic way to go.
We really don't need to and shouldn't make any changes before we need to. There's really nothing to worry about quantum attacks.
In fact, if looking at the Bitcoin code, we can see that Satoshi have already made multiple ways to mitigate such worries.