I think this mindset is part of the issue. You cannot converse with a deceased historical figure. AI does not change that. If you want to know what they said on a topic, you might be able to search through their work, or read others interpretations of their work, but there is no way to ask them something they did not previously address and get an honest answer. You may be able to get an educated guess, but there is no way to know someone's thoughts unless they were somehow already expressed. If you're ok with AI just guessing as to what they might have said, then how are you to distinguish what they actually believed from things the AI just decided they believed. If you'd require the AI to add a disclaimer ("I never spoke on that, but if I had to guess...") then who decides what follows? There's plenty of debate on how to interpret certain works already, so which side does it tell? Does it do both? Is it going to both sides everything? I don't think that would be a positive.
I understand wanting to be immersed in history, but I think original sources are our best way of doing so. I think movies or historical fiction books provide the necessary distance so there's no real confusion. If you watch a dramatization of a historical figures life I don't think people assume that every line is a direct quote. That kind of media also keeps the interaction on rails, so there's no need to answer if George Washington would have enjoyed a brat summer. With AI people can often get whatever answer they want while using leading questions. If all of that was locked down, you'd be left with a fancy audiovisual quoting preexisting first party sources that just removes the impetus for the user to do any kind of sourcing themselves, while wasting time and energy.