I reckon the most likely situation to occur will the poh will be complete, so no more poh rocks, but museum will continue to be a diversion distraction each week. So probably put rocks on and it explodes but then you get nothing but the xp for putting them on. I guess its meant to be a diversion and they probably want it to continue.. Not that I would continue it at that point. Fun while it lasted. Hm, for my own sake I hope that you can't continue with the diversion unless you destroy your poh statue. It would be better if the activity has some sort of concrete conclusion.