First time posting in this forum, hope this is the right place for it.

Nothing more frustrating than an abandoned story arc. We all hope it'll conclude or finish up in a later issue, but sometimes story arcs or plots we've been loving just get abandoned and ignored. Typically happens as a casualty of a new creative team coming in, or victim to the publisher's need to start a new volume with a #1 issue, or just plain laziness.

Between 2008 and now, what is your pick for the worst case of an abandoned story line?