I've been in denial of this for quite some time. But I'm at the point where I understand why warwick should not be nerfed.
It's pretty simple actually, warwick is on a clock. He has a huge pressure in the laning phase and an ok mid game depending on how ahead he was able to get, but when late game comes, there are executioners, merc scim, hourglasses, whatever that support item is that cleanses, lots of peel (sometimes :^) ), and carries that can burst his ass out of a fight pretty fast due to their scalings.
So say he gets really ahead and takes all the kills in early game, but his team is actually relatively behind. He probably loses game cuz of these reasons.