truth be told i was kind of glad it happened. Glenn really had no purpose to the story in a long time. He was kind of just there now. Although truth be told I was hoping it would be Sophia. I think that would've made me hate Negan much more.
Well to be fair, Kyle and Yost did plan another storyline involving Wallflower but because Warren Ellis used her in Astonishing X-Men; they had to make quite a few changes to the storyline. I know that this wouldn't save the storyline but it shows that maybe the story they had planned originally could not be delivered the way it was intended.