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I believe we will have a CRQC by 2035. I also believe Bitcoin will upgrade before then and be just fine. But, in the process, we will see the cycling of Bitcoin ownership from individuals to institutions accelerate. That is the true point of my (admittedly probably poorly written and meandering ) post.
No shot there's a CRQC by 2035
I would tamper your quantum worries until they demonstrate they can factor numbers considerably bigger than 15....
FYI, "factoring 15" was about factoring a specific kind of composite number, the smallest whole of which is decimal fifteen. IIRC there are multiple composites that could be used as RSA moduli that were simultaneously factored by the researchers, and the interesting / worrying challenge is the question of determining whether some arbitrary RSA modulus belongs to that kind of composite, and after confirming that, interconverting from binary to quantum becomes a negligible cost.
I would tamper your quantum worries until they demonstrate they can factor numbers considerably bigger than 15....
For your other points, there are elements of truth to them, but those are all unconnected to quantum.
A better way to envision bitcoins growth, and the problems associated with such growth, is to see it how the internet itself developed.
When the internet first arrived on the scene in the late 80s / early 90s (I was there), it was ruled by a real cypher / cyber punk aesthetic. The internet was going to decentralize everything. We would all be running our own mail servers - all comms would be P2P, encrypted and secure.
As the masses started to pile into the internet in early 00's, that dream fell apart. The masses, by and large don't care about ideology, they just want something that works with the most minimal effort. So we got gmail, facebook, and youtube.
However, the original internet is still present. You can actually run your own mail server. You can still communicate securely, etc. It just takes some effort.
I see Bitcoin growing in exactly the same way, >95% of the masses will use their SQL backed custodial wallet and invest in ETFs. However the real bitcoin will still be available for those who want to use it.