I think this Sunday's game is critical.
If Juventus lose or draw against Palermo, a replacement for Ranieri has to be pursued. If the team is not Top 4 by the end of October, Ranieri has to go. Wait too long, and the season could be in jeopardy. While two wins and three draws looks like undefeated, the points translate to winning three games, and losing two. Judging by the opponents Juventus has faced... being a even team does not cut it. Teams like Juventus should not be squeaking out draws against Sampdoria, Catania and freaking BATE.
Gasperini, Cosmi, Colantuono, hell, even Mancini would probably be upgrades on what we have right now. I would avoid Grant though, same with Donadoni... don't like Donadoni's attitude and the way he tried to villify Lippi.