There's an awful lot of ignorance there, which should be no surprise, being DU and all. Certainly Lincoln opposed slavery, but the newborn Republican Party was a coalition of several factions, not all of whom were militantly focused on slavery, and without the War, it would not have been feasible for him to do any such thing as abolish the institution himself, either in a legal or a political-reality sense.
It probably would have hung on until the end of the century in parts of the South if things had been able to be de-escalated. Keeping it depended on Southern solidarity, and I suspect that as soon as the tide turned in a couple of the marginal Southern States, the block would have lost cohesion and been forced to deal with a Congress and Supreme Court that supported abolition by a sufficient margin to finally resolve it against them...but in 1860, that time was still far in the future.