As much as I would like Glen to be alive, I think for them to bring him back now would strain the credibility of the show to the point some people would give up.
I thought it was a stretch when he was shot and beat up by Aidan, exhausted, and covered in 2 walkers lying on the ground he was probably done. But back he comes. To do that again, multiplied by about factor of 100... you might as well reveal that he is actually Batman and has been in disguise as a teenage asian pizza delivery guy all this time.
Agree completely. If Glenn lives, squirming under the dumpster will be the new jump the shark.