Shouldn't we consider quantumizing Bitcoin?
What do you mean?
There is no such thing as secure public key cryptography.
The only way to make Bitcoin, or anything else, secure over public lines is to use one time cyphers. Like everybody could have a thumb drive with gigabytes of random data, and share a few kb each communication to secure it. To do that ultimately each network would have to begin with a physical exchange of keys.
Some companies are trying to perpetuate the pkc scam into the quantum era.
Britain is heavy on that since pkc has given them enormous benefits over other countries til now. They have companies like Arqqit developing all kinds of silliness to continue the trickery.