About the structure changes, like everyone is saying...this is only going to make things worse. While some greedy people abuse pillaring, mostly it is done to protect resources. For example: pillaring carno island to protect it from development so that it is there as a resource. On my server herbivore island has been completely despawned by one person, dinos and all resources gone, and the entire island walled off by this tribe. Look into griefing complaints and fix the problem that way, don't take away a community's ability to protect the resources left. My base is built on Weathertop, we have resources protected next to our base: beaver spawns, a small section of trees, stone, and bamboo for berries. Without pillaring, we would be forced to acutally build houses to protect the area from development, defeating the purpose, because those houses will block the resource spawns. Let's think this through a little bit.
