I have not gone through all the threads on this great message board so I apologize in advance if the topic has already been discussed. I am a big advocate of Kirkman's graphic novels and managed to catch up on the first two seasons of the tv show, marathon style, after coming back to the US once my service tour was done. Wonderful, just in time for Season 3 to begin.
Both me and my girlfriend and several other friends absolutely adore Glenn because he is the only one who seems to be the conscious and moral compass of the group; something that is very much needed in any apocalyptic event when people abuse and feed (no pun intended) on one another. His conscientiousness and selflessness is a great asset and endearing to any group in the ZA.
That being said, we're starting to be a little concerned on where his character is going. In short, nowhere. During Season one, some of his shining moments were when he was strategizing on how to deal with tense and dangerous situations. The first time was when he, Rick, Jacqui, Andrea, and Morales were trapped in that basement of a building in Atlanta. He was dictating how things were going to go down and everyone respected and followed his direction. The second time was when he, Rick, Daryl, and T went back to Atlanta for the bag of guns and Merle. He quickly jotted down a plan of action; even Rick and Daryl gave him a look when they asked him "Hey, kid. What did you do before all this?" Besides, who can forget the famous quote he transmitted to Rick while he was in the tank at the end of the pilot episode?

As the episodes went on in Season 2, he seemed to lose his decisiveness and confidence (some of which were explained with his "situation" with Maggie). He wasn't a fly on the wall but much of his "screen time" has been diminished significantly. I never believe personal growth, in life or fantasy, should ever be a zero sum game but it feels like after the midway point of Season 2, it started to turn into "The Walking Dead: Commentary by Rick and Daryl." The writers only really seem to focus on these two individuals. Daryl is the only one who even has a character arc (encounter with Merle) before it even happens!
I know Season 3 just started and we should give the writers more time to flesh out the "supporting" characters but at this juncture, what is Glenn's point? Bear in mind that I don't dislike the character of Daryl, in fact, I think this personal growth is great to watch but is it coming at a cost of the other characters (including T, Carol, Beth, etc)? I don't think standing around counts; only instances where they are actually speaking.
At this point, I would much rather he be around for one season, be great, and go out in a blaze of glory instead of having him be around for 5 seasons, dissolve into uselessness, and rubbed out without anyone even noticing.