Yes, thank you.
I believe the wording should have been
If there had been no Civil War, when and how would the institution of slavery have imploded
I posted something similar to this already, and thank you for bringing this to my attention.
My take (and this is only a take, which is the best any of us could give):
The phasing out of mass agricultural slavery was inevitable (though it may have taken longer than the optimists think), but the
abolition of slavery was not. The South had a sincere and very real fear of retaliation should slaves be freed: the idea of vengeance and retribution and them all getting murdered in their sleep. One of the most powerful anti-abolition arguments is "think about what we've done to these people! What would they do to us if we took their chains off???"
As a result, a peaceful phasing out of mass slavery would 100% have to be accompanied by the Colonization Society deporting the slaves to Liberia, by force rather than voluntarily.
Also, I think that
domestic slavery continues on as a show of wealth and power for wealthy southern families, to the point where deep in the 20th century, people would show off their power by having slaves in the house.