upgrading to a post-quantum protocol in a conscientious way will take several years at least. when are we gonna start discussing the details?
When cryptographic community as a whole will reach both 1) a consensus on what quantum-ready algorithms will become the standard and 2) decide that it's time to start switching to it.
There's no need for Bitcoin to be on the cutting edge cryptography, it would only mean unnecessary risks and forks after forks.