I personally don't bother too much just because if someone Google, 3 letter agency or even aliens will come up with a quantum computer satoshi's funds will be the last thing that we'll need to worry about.
Just think about all the "password protected" (encrypted) things that are out there, like: financial system servers , electricity servers, medical care servers, airplanes servers, nuclear missile codes. These are things much more valuable and important than 1M bitcoins.
How about in a decade or two, when Bitcoin's market capitalization might be in the trillions, or tens of trillions? Valuable enough?
We're also talking about much more than 1 million bitcoins. It's 5 million+ that have exposed public keys and theoretically
the entire supply if QC is capable of breaking transactions in flight.
Centralized infrastructure also requires far less coordination to secure. In a zero-day situation, governments and banks could react far more effectively than the decentralized Bitcoin network ever could. If QC broke ECDSA in the wild today, I don't think Bitcoin would ever recover.
I like your enthusiasm, and I hope Bitcoin will hit tens of trillions in value.
"Valuable enough?"
- No. Not more valuable than a human life, at least for me.
As for the Quantum Computers, if this will happen of course Bitcoin will be worthless like everything out there using encryption, but I'm sure Bitcoin developers will launch a new Quantum Resistant Bitcoin maybe called qBitCoin.
Don't be afraid, we will adapt like we always do, as humans.