Probably some red shirt, though they make it appear like Rosita, Michone and Karl are about to force a confrontation with him right now.
Would they get rid of another regular character just a few episodes after getting rid of two others? Probably save that more for the season finale.
Rick is talking about just living under Negan, because he's too powerful and got Daryl, etc.
But maybe it takes more deaths to those close to him or maybe even implied threat to Karl or Judith, since Karl may have forced Negan's hand.