I like the proposal, there will also be an intermediate time when AI WILL be able to sign content a sYOU with your own private key without the AI having access

I like the proposal, there will also be an intermediate time when AI WILL be able to sign content a sYOU with your own private key without the AI having access to your original private key or without you knowing it. How? A quantum computer will crack enough existing content signed with poor / old keys that use algorithms that are not quantum safe.