Sharks, Broncos & Tigers are in danger mainly because of their fairly difficult remaining draws.
Sharks: Souths (H), Storm (A), Cowboys (H)
Broncos: Storm (H), Manly (A), Panthers (H)
Tigers: Bulldogs (H), Roosters (A), Storm (H)
I'd say there is a good chance that those 3 teams will get a maximum of 1 win from their remaining 3 games.
The Knights would still have to improve out of sight to make it.
Raiders who knows...
Titans would probably need to win 3/3 to be any chance which means beating Manly at home.
If Knights can jag a miracle win against Manly I think they'll be there. Sharks look most likely to drop out at the moment, followed by Tigers (just because Broncos F/A is better), if any.