Lightning is not getting nerfed, from what i remember it's only gonna get a buff, it's heal attack will clear debuff as well.
This is exactly the same as people who were saying roshi gonna change the meta and be the new tobi when he comes lol.
Yeh we will get 2 ninjas that are good vs some lightning teams, Tobi who will be same price as cursed Hidan and Han who is 200 pulls, they will probably both be rarer then Roshis are now.