Should we blame the death of Dale to Jeffrey Demunn--whom literally decided to leave the show because, I think he is getting bored with it. But after he shot the scene where his character dies--he changes his mind. But AMC didn't want Dale to come back because of they didn't want to spend any money to re-shoot the scene, where, if it happens. Dale lives.
Personally I would think that if Dale continues to live upto Season 3 at least. Something very interesting were about to be seen between him and Andrea.