I think it was great that builders are willing to help players with plots by making props. It is awesome they reminded us all of this at the town hall.
At the same time, I would personally love it if some of these would fade away over time. The number of bodies and heads and other such things just keep stacking up. Not only does this make little IC sense to me, it also lessens the impact of such acts going forward.
Right now I think it's mostly, "Another body/head on display? Right. Okay." I think this is because so many players have seen these things day after day for years. They don't go away and just start to blend in to the background.