Regardless of discipline, people who go against land owners are going to loose their trails. Once "everyone" learns this your trails will stay open. Traditionally I am willing to bet that a lot of the problems in the states with trail closures are caused by dhillers and freeriders ripping it up without permission. Regardless of what you think, without the permission, certain riders make mtbiking look like a bunch of ungrateful kids who break the rules. Aka it ALWAYS looks like freeriders cause the problem