Most of the balanced rocks in the world are really quite firmly placed. It will take some time and lot more erosion to unseat this one for example. But time and the weather will continue to chip away and some time, perhaps in the distant future, this one will fall as will all the others. What is not allowed under the laws of the United States is to hasten the process in any way. There have been a couple of notable cases where natural features have been destroyed recently and the consequences for the perpetrators have been severe.