Pretty sure TV Negan will end up like his comic counterpart. Even if he stays as the leader of the Saviors when the Whisperers arrive, for sure he will make an alliance with Rick's group (albeit an uneasy one) to take on the bigger threat.
So far everything involving Negan in the tv 显示 is identical to the graphic novels. I don't see why it wouldn't continue down that path with him becoming 更多 sympathetic like he did in the graphic novels.
We'll get there eventually, he only just appeared on the show, so it won't happen right now.