I'd actually really like to see them kill off Daryl just for that very reason - to prove nobody is safe. Nobody we consider "safe" has died on the show yet IMO.
Okay so you kill Daryl, "No one is safe bla bla bla" But who is as likable as him?
I understand that this is a zombie show where anyone can die and Right now everyone in Rick's group is likable pretty much, but Daryl is the most interesting and likable character for a lot of us,
So you take him out and there is going to be this really huge hole in the show. Is not so much as no one is safe, but "no one is as good of a character as Daryl"
So you kill him off and you might risk ruining the show.
(Unless they bring a new character as cool as him, which i doubt"