Jumping in LR was useful for traversal, and in battle for juggling enemies. In KH, jumping can be used to avoid attacks, and attack enemies from above. So no, I am not talking purely about traversal.
And no, Warp will not perfectly replace Jump. Jump is short and fast way to do the above, has no cost and it doesn't take you out of the battle field. Can you attack an enemy from above while standing on the same level surface as the enemy using a single warp to enemy? Warp does have other benefits over Jump however, but it's not a reason to not have jump at all.
We obviously disagree on pretty much everything here, but yes, let's just wait for tomorrow