Yes they would have Slavery. Was already a dieing institute, in the South given the means of advancement. Of farm technology, the cost effectiveness. And, Religious reveals taking place in the South Slavery. Would have died out easily
Yes, it was a dying institution all over the world, but the slavocracy steadfastly and violently refused to let it die. Rather than face reality they turned on their fellow countrymen in open insurrection.
In their pretend constitution they enshrined the Peculiar Institution and made it permanent and inviolate. They announced to the world that they would do ANYTHING to perpetuate and advance slavery in America - and kill anyone who opposed their aims.
They proved to the world that they would allow people to die easily so that their beloved slavery would persist.