One of the things that I have seen is that some are not marking their fields properly for the buildout line. The line ends up closer to the half line, or closer to the penalty area line. This defeats the purpose of the buildout line. In the case where it is closer to the penalty area line, it gives extra attacking space to opponents and is unfair to the goalkeeper/defenders. As for the rules, the initial shock will wear off, but there will always be the on-going challenge of educating new referees on the rules (which will be easier for them, as they will not have the 'old way' stuck in their head ), new coaches, and parents. Educating the parents is absolutely necessary to ensure that they are in tune with the game, and keeping them off the referees back. Coaches/parents who played in the 'day', often transpose their playing rules to the game of today. Things have changed.