[user104658]

... By which I mean, if they continue to follow the graphic novels, Negan himself still has a role to play in future storylines even after the Saviours are dead and buried.

Then again they could do it better than they do, like have him actually keep himself out of harms way for the mostpart (he could have shouted / spoken to them from behind a barricade, just like they were, would actually have been quite effective imagery) instead of him constantly being in situations where someone could clearly stab / shoot / whack him with something but just... Don't do it...