Riot should make Nunu's W buff him at 40% while it buffs Allies at 20%
That way, Nunu isn't hit directly (because how often does Nunu even get enough AP to make good use of it?) but his stat-boosting of allies remains delayed until they hit 600 AP instead of 300. Nunu's power levels are going to change if RIot changes his W to no longer buff him in the way it does, and he'll probably need compensation buffs elsewhere for it. Right now, Nunu's best build for being a Jungler in this meta is to go Predator + Runic into a tank build, and that's going to nerf Nunu's ability to function properly.
That seems reasonable, doesn't it? Let's not nerf Nunu too hard just because one champion is abusing him, yeah? That's not fair to Nunu.
I do this very specific build path:
