Any policy can be repealed or amended to the point where it is meaningless. The board which passed it can do either of those things. A board with superior powers can do them. For example, some states have system wide university boards which can usually overrule the decision of a board which governs a single campus. State legislatures can usually overrule local governments. In many states, voters can repeal government policy with referendums and initiatives. There is no way to eliminate the possibility that any of these things might happen. There are a few things you can do to improve the odds.