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Also if there's a credible quantum threat, banks can upgrade their centralized systems in a day to be quantum-proof.
Whereas Bitcoiners need to find consensus among decentralized players.
You've clearly never worked at a bank
And there is also another problem. Even if a solution is implemented IMMEDIATELY, all the money must be mived from from the old to the new addresses, which will take time since the block space is limited. And I also don't really know how long the time between quantum becoming clear that it will be an issue and the time it becomes an actual issue, so that's another problem.
Are there quantium resistant algorithms that are feasible for bitcoin (small enough signature to fit in the blocks)?
Simple Analogy
Banks = You hire a security company to guard your gold
Bitcoin = You hold the gold yourself in a vault only you can open.
This analogy is completely useless for illustrating threat or threat resistance to quantum computers
You know why, it feels completely useless.
But arguing about it, it's another time wasted
Arguing about the analogy or about the quantium resistant algorithms?
To be honest that is a bad analogy. The pin code has three attempts, cracking the private key doesn't have retry limits.