Yes, let's not forget that Daryl, Carol, and Beth are not even currently (or have ever been, in the case of Daryl) in the comics at all! Rick is still walking around with both arms and hands fully intact even though the governor has long come and gone. Dale died well before he did in the comics and we still have Andrea around. Even little Judith was a goner in the comics. So there is absolutely no evidence that Glenn is going to bite it this season or ever (I hope not, he's always been one of my favorites).