TBF Negan seems to completely condition people to fear him, or respect him, its what he done in this latest episode with Carl, and is what he done to Rick in the first episode. We've currently got Carl, Maggie, Michonne, Rosita and probably Spencer all game for attacking Negan once they get a chance. You'd also have had Abraham and Glenn who'd likely be willing too, while Darryl would too, but again, hes been conditioned.
Not sure how many actual chances they've had to attack him either, tbh. They have absolutely no idea where his main base is, and any time he's near them theres a fuckload of saviours there too, who'd just kill everyone the moment Negan dies, a point a character made in the last episode so is obviously something the characters are aware of.
I do get a feeling with this latest episode showing Negan being, relatively, nice to Carl, being nice to Judith, and even apologising to Olivia, that something fucking horrendous is on the way.