Sales could always fall enough to the point he gets replaced, and there’s always behind the scenes stuff going on that could cause plans to change. If DC does indeed plan on putting him on Batman with issue 100 that could be the end point of his Superman tenure, or at least force him off one of the books. Issue 25 on both Superman and Action could be an ending point, but I don’t think that’s his plan for right now at least. Issue 50 on both does seem more reasonable.