It's in all likelihood a longshot. Given the politicization of the current Supreme Court, I would not expect much from this particular group of nine- or, more to the point, this particular group of five that is the majority of this group of nine.
But there will be a chance to reconsider the Citizens United decision, as the Court has agreed to take up a case out of Montana, American Tradition v. Bullock, that essentially argues that Citizens United only applies to federal-level elections and not state-level elections. This will be argued with the benefit of knowing just what has happened concerning campaign financing in the wake of the Citizens United decision.
Again, though, given the current split and the current mindsets, don't get your hopes up. Unless a seat happens to become vacant between now and then, of course.