I like your optimism.
Thanks for taking the time with such a complete answer.
You are very verbose when writing and you argue well.
There really are worse things for bitcoiners to worry about, from more basic things to sophisticated threats that have not yet been realized.
I just believe that overconfidence in limited, temporary things that depend on human action is dangerous. Like it or not, Bitcoin is also one of those things.
Many bonuses usually carry an equivalent burden. A robust security network like the Bitcoin network, probably the most secure in the world, is difficult and time-consuming to make changes like this. If they procrastinate, trusting in current security, there may not be time to do a soft fork and who knows what will happen if there is a hard fork suddenly. Imagine the congestion of many people wanting to transfer to new addresses and exposing their public keys with the possibility of being cloned. This is a terrible scenario.